Most Populous cities in the World

Power banks: A strength bank is a cell additional accumulator for the electricity deliver of mobile devices along with tablet computer systems and specially smartphones . It is a cell energy storage tool , however not a charger , because the charging electronics for charging the related devices are built at once into the corresponding devices The advancing miniaturization andthe trend in the direction of ever flatter cellular devices units technical limits on the capability of the battery cells that can be included into the gadgets . Additional, externally connectable reminiscences were developed so that it will increase the lifestyles of the gadgets in computing-intensive applications. Power banks that can price appropriate gadgets thru the USB port are widespread. But there also are correspondingly large and greater powerful devices offered, which are available thru an adapter system, commercially available laptops or notebooks with the usual voltages, e.G. B. 12 V or 19 V.A power bank is generally prepared with one or more lithium polymer or lithium ion battery cells . It contains a circuit for stabilizing the output voltage and output modern and regularly a trademark for the operating or rate status . Power is provided to linked gadgets thru one or greater USB ports (kind A); charging is commonly thru a micro USB port on a pc or an outside energy supply.The feasible charging and discharging currents are not standardized and can deviate drastically from the USB specifications. Power banks with different outputs are technically possible, e.G. B. For Fire Wireor Thunderbolt , but rarely found in practice.Power banks with USB outputs are to be had with nominal capacities ( quantity of electrical price) between much less than one thousand mAh to well over 20,000 mAh, the current that may be output can range between 500 mA and over three A.The capacity statistics normally refers back to the integrated battery, not tothe removable electrical electricity. For USB electricity banks, the output voltage is constant at a nominal five V at some stage in the usage of the same old USB standards, relying at the connector used. This effects in a theoretical electricity storage capability through the definition of theelectrical energy ( current times voltage along with utilization time)from 5 Wh to 100 Wh. (For comparison, an electric light vehicle like the Renault Twizy affords 6100 Wh with its cells that can definitely be used.) If there are numerous connections available, those are regularly not equivalent,so they're for a exceptional maximum Electricity shipping specified. The charging efficiency may be well below 50%, however even splendid devices rarely attain more than 70%.Comfort features can include, for instance, a built-in flashlight or the virtual show of the charging and working status. A electricity bank is suitable as a backup battery if it can be charged and discharged on the same time. Not each power financial institution is appropriate for charging devices from the manufacturer Apple, a few handiest paintings with a proprietary charging cable from this manufacturer. Some energy banks have or more outputs, certainly one of which is regularly dedicated to iPhones or iPads.There also are high-cutting-edge strength banks to be had, which may be devoted or used as an additional feature to assist begin cars. Bluetooth headsets: Bluetooth headsets connect thru a specialized sort of wi-fi network to your telephone. Using technology developed mainly for the motive of putting off the need for the unsightly andungainly wires that once had to be used to attach a headset to a telephone, Bluetooth headsets enable you to talk and hear thru an earpiece at the same time as leaving your arms free. The technology concerned in a headset helps make certain that their use is secure and outstanding, all whilst maintaining the security of your telephone. Bluetooth dates returned to 1998, and the first Bluetooth headset the use of this era became shipped in 2000. Bluetooth Network: A connected Bluetooth headset becomes a part of a special, localized wireless community. The headset acts as both the transmitter and receiver of the wireless signal. Bluetooth's signal itself isn't like comparable wireless signals because it includes radio waves configured the use of a complex set of rules to ensure clean reception and transmission between your headset and your telephone. The result is clear sounds getting into your ear, and clear speech transmitted via your microphone. Bluetooth wireless networks require a figure tool, which inside the case of a headset is your telephone.Multiple devices may be connected to a single Bluetooth figure tool. However, those gadgets, like your headset, cannot communicate with each different but can best send and acquire alerts from the determine smartphone. The specific configuration of a Bluetooth network limits theentire quantity of peripherals -- along with a headset -- that can be connected to a master device to seven. Pairing: For a headset to talk facts to the telephone, it needs to be paired with the handset. Pairing is the term used to describe the procedure whilst an information link is created between a Bluetooth accessory and determine tool. For pairing to work, both devices should have Bluetooth pairing grew to become on and be set to a discoverable mode. Headsets have a Bluetooth password PIN quantity which you have to enter into the telephone to spark off the pairing. This tells the phone to authorize the introduction of the connection. Power: As with any cellular device, battery existence is important for a Bluetooth headset. If a amazing deal of strength become required to transmit or get hold of alerts from a headset, it would want a battery too massive or too heavy to make it realistic to be worn at the ear. The frequency and quick range nature of the Bluetooth sign, however, requires by way of design very little electricity to operate. The low-strength nature of the signal additionally limits the variety allowed among the headset and the discern telephone. The absolute most distance you can positioned between a headset and the discern smartphone is round 164 feet. Further variations atthe unique Bluetooth generation have enabled even greater reductions in the amount of electricity required by using a headset. Headset Technology: Sound sign high-quality viable over the Bluetooth connection is quite good. However, the restrictions inherent in small microphones and earpieces often create compromised sound quality. Headset designers use noise-cancelling era to attempt to create a better excellent sound sign with muchless interference. Manufacturers use loads of specific technologies to improve sound satisfactory. Dualmicrophone setups are utilized by some producers to filter out extraneous noise that's further from the mouthpiece. An instance of technology that improves the signal received at the headset is bone conduction, a way that transmits sound vibrations via the temple in preference to projecting them into the ear canal. Cables &charges: Smartphone chargers have gone through a diverse evolution that has protected cradles, plug-in cords and difficult to understand connectors. However, greater recent gadgets normally use micro-USB. (Apple gadgets nevertheless use proprietary cables, although the form-thing in their 30-pin plug used on older gadgets has proven up elsewhere. External batteries can be protected in instances, but can also be connected to the smartphone through rubber suction cups. Most computers and electronic devices have a few shape of USB connection, and many devices additionally come packaged with a USB cable. What are most of these one of a kind cables for, and why does it remember which one you use?It can be somewhat complex to wrap your head round all this.USB is supposedly universal, but there are so many one of a kind sorts. Why is this? As it turns out, they every serve one of a kind functions, specially to hold compatibility and support new gadgets.Here are the six maximum commonplace types of USB cables and connectors:• Type-A: The fashionable flat, square interface which you find on one give up of nearly each USB cable. Most computer systems have multiple USB-A ports for connecting peripherals. You’ll find them on game consoles, TVs, and other gadgets too. This cable best inserts in a single way.• Type-B: An almost square connector, primarily used for printersand different powered gadgets that connect to a computer. They’re not very not unusual these days, as maximum devices have moved onto a smaller connection.• Mini-USB: A smaller connector type that become standard for cell gadgets before micro-USB. While not as not unusual today, you’ll nonetheless see these on a few cameras, the PlayStation 3 controller, MP3 players, and similar.• Micro-USB: The present day preferred (although slowly declining in popularity) for mobile and portable devices, that's even smaller than mini-USB. While you’ll nonetheless locate micro-USB on all kinds of smartphones, tablets, USB battery packs, and sport controllers, some have moved onto USBC.• Type-C: The most recent USB wellknown, this is a reversible cable thatpromises higher transfer rates and more strength than previous USB sorts. It’s additionally capable of juggling more than one functions. You’ll see it on many new laptops and smartphones, inclusive of the MacBook, Pixel phones, and Nintendo Switch Pro Controller. We speak USB-C more beneath.• Lightning: This isn’t a real USB fashionable, however is Apple’s proprietary connector for the iPhone, iPad, AirPods, and extra. It’s a comparable size to USB-C and comes fashionable on Apple gadgets launched on the grounds that September 2012. Older Apple gadgets usethe much larger 30-pin proprietary connector. For more on cables, adapters, and ports for Apple devices, check our guide.In most instances, you’ll locate USB cables have one popular kind-A give up and one type-B stop of a few sort. The type-A stop powers the device, whilst the kind-B cease receives power. This is to prevent capability damage that might be because of connecting computer systems via USB-A, for example.The Mini and Micro connectors are taken into consideration smaller kinds of kind-B, even although “type-B” is typically now not of their name.In general, the cables you’ll use the most, and therefore need to replace, are micro-USB, USB-C, and fLightning. USB connection types are simplest 1/2 of the story, as USB has additionally gone via multiple requirements of varying facts switch speeds. The cable’s connector doesn’t necessarily mean it makes use of a certain trendy.The three principal iterations of USB’s pace are:• USB 1.X became the unique standard, and is ancient through cutting-edge benchmarks. You’re most unlikely to discover gadgets the usage of this standard nowadays.• USB 2.0 added many present day USB norms, together with help for Mini and Micro cables, USB OTG (see underneath), and extra. It’s the slowest pace of USB nevertheless used today. You’ll find it used on cheap flash drives, gadgets like mice and keyboards, and comparable. Most computer systems also include some USB 2.0 ports.• USB 3.X is the cutting-edge fashionable for USB speeds. It’s a whole lot quicker than USB 2.zero, and thus advocated for gadgets like outside hard drives. You can generally discover a USB three.X port or connector with the aid of its blue coloring. Many USB three.zero ports also have an SS symbol (which stands for Super Speed). Most new computer systems have as a minimum one USB three port, and good-quality flash drives use this standard. CASES AND COVERS: Cases, which can be designed to attach to, guide, or otherwise preserve a smartphone, are famous accessories. Case measures are primarily based at the show inches (e.G. five inch display).There are extraordinary types:• Pouches and sleeves• Holsters• Shells• Skins• Fitted instances• Bumpers• Flip cases and wallets• Screen protection and body films• Drop and shock safety• Leather caseHolsters are generally used by myself for gadgets that include rubberized padding, and/or are product of plastic and without exposed rigid corners. Heavy duty cases are designed to defend from drops and scratches.A Standing case maintains the tool standing upright. Folio cases are a aggregate of a case and stand, and might encompass a keyboard (USB for OTG smartphones or Bluetooth keyboard).Skins and design covers can serve for safety and personalization. These are the end result of the relatively "naked" designs produced by way of producers which includes Apple, where the metallic and glass components of the device are uncovered and at risk of damage. They are wonderful from holsters, in permitting use of the device at the same time as in the case, however commonly include a belt clipor other tool giving it the functionality of a holster. They are fabricated from difficult plastic, rubber, silicone, leather, or adhesive-subsidized vinyl portions. Vinyl material may be calendared or cast, withthe latter being extra expensive. Calendered vinyl is expected to simplest be used for brief-mid duration (10 years), even as forged vinyl is used on a extra long-term basis. Calendered vinyl also tends to shrink in the warmness and can be formed into any form (above 80 ranges Celsius), and may fade in direct sunlight.Customized smartphone cases use custom printing. Different agencies have one of a kind techniques of printing on cases; a few utilize sublimation, others Inkjet-printed skins, others dye-sublimation 3- D printing strategies.Functional cases can integrate external batteries or a USB, Bluetooth, or WiFi keyboard and touchpad. SCREEN PROTECTORS: A display screen protector is an additional sheet of cloth—commonly polyurethane or laminated glass—that may be connected to the display of an electronic device and defend it against bodily damage. The first screen protector changed into designed and patented by way of Herbert Schlegel in 1968 for use on tv screens.Screen protectors first entered the mobile-tool market after the upward push of personal virtual assistants (PDAs). Since PDAs had been often operated via a stylus, the end of the stylus should scratch the touchy LCD display screen surface. Therefore, display screen protectors furnished sacrificial safety from this damage. Since then, the ubiquity of cell devices have seen the display screen protector end up greater extensively used.Screen protectors are made of both plastics, which include polyethylene terephthalate (PET) or thermoplastic polyurethane (TPU), or of laminated tempered glass, much like the device’s unique screen they may be supposed to guard. Plastic display screen protectors cost less than glass and are thinner (around 0.1 mm (0.004 in) thick, in comparison to 0.3 to 0.five mm(0.012 to 0.020 in) for glass and greater flexible. At the same price, glasswill withstand scratches higher than plastic, and experience greater like the device's display, even though better priced plastic protectors may be better than the most inexpensive tempered glass models, considering the fact that glass will shatter or crack with enough impact forceScreen protectors have been recognised to intrude with the operation of some touchscreens Also,an existing oleophobic coating of a touchscreen will be covered. When the screen protector is removed, the oleophobic coating can be damaged or removed totally sometimes.On a few gadgets, the thickness of display protectors can affect the appearance and sense of the tool.A tempered glass is made through heating the glass under extreme temperature, then rapidly cooling it in a controlled treatment procedure to boom its strength. This sort of glass includes multiple layers of cloth, normally composed of an absorbent silicone coating, anti-shatter movie, tempered glass and oleophobic nano coating. All these layers are compressed into one scratch and warmth resistant material this is up to five instances more potent than a normal glass. One unique characteristic of the tempered glass display screen protector is its shatterproof property which offers a high degree of safety when the glass is broken. Rather than sending flying jagged shards into the air, the glass will break into small, stupid chunks even as all the broken pieces are kept in place. For this very reason, tempered glass is often used in areas in which safety is an issue, consisting of the encompassing and lower back windows of a car.The strength of the tempered glass is able to withstand impacts from drops and shock, making it a desirable cloth for phone screen safety than traditional film display screen protectors.In addition to its shatter-proof feature, the tempered glass screen protector also gives your finger the same smooth feel of glass without all the oily fingerprint residue. Its anti-reflective glass offers the same image sharpness and touch screen sensitivity as your phone’s original screen. The material has a hardness rating of 9H which means more resistance to scratches from sharp object and damage from impact. Now you can peacefully store your keys and your phone in the same pocket without a worry.While there are many cheap options for tempered glass screen protectors in the market, not all of them are manufactured the same. Depending on the quality, a piece can range anywhere from $2 to $50 each. Keep in mind, you get what you paid for, so don't opt for the cheapest option. It would make sense to spend a little more money and go for a higher quality brand to ensure the best quality protection for the money.Here's what to look for when picking the best tempered glass screen protector for your phone:• CLARITY: Poorly made tempered glass screen protectors create glares and reflection under direct sunlight, obstructing your view of the screen. Quality tempered glass mitigates this issue by treating the glass with anti-glare processing to reduce the reflection and increase clarity.• RESPONSIVENESS: A quality tempered glass will retain touch screen sensitivity and smoothness even through its 0.3mm thick glass. Unfortunately, this doesn’t stand true for cheap tempered glass. So, saveyourself the frustration and invest in a screen protector that will obey your command.• OLEOPHOBIC – All tempered glass screen protectors should come with oleophobic top coatings which eliminate oil and smudges from the glass surface with ease. If you frequently have to clean the screen for fingerprints, perhaps the top oleophobic layer has worn off and it is time to consider a higher quality protector for those dirty screens.• EASE OF INSTALLATION: Installing a tempered glass screen protector often seems like a daunting task for most phone users. Therefore, it is vital to find a glass that is can offer a painless application without all the air bubbles. We reLook for a tempered glass screen protector that comes with an installation kit (guide stickers, alcohol wipes, microfiber cleaning cloth, additional stickers for removing lint) to make the process a bit easier. Here's a quick video on how to install an iPhone glass screen protector: SELFIE STICKS: A selfie stick is used to take pics or video by way of positioning a digital digicam tool, typically a phone, beyond the regular variety of the arm.This allows for photographs to be taken at angles and distances that would no longer were feasible with the human arm by itself. The sticksare typically extensible, with a take care of on one stop and an adjustable clamp on the opposite give up to hold the device in place. They are maximum usually used for taking selfies with digicam phones.Some are related to a cellphone via its jack plug, at the same time as others are tethered the use of Bluetooth controls. The connection among the tool and the selfie stick shall we the person decide while to take the photo or begin recording a video by means of clicking a button located at the take care of Models designed for compact cameras have a reflect Behind the viewscreen so that the shot may be coated up. In assessment to a monopod for stabilising a camera on the ground, a selfie stick's arm is thickest and strongest at the opposite cease from the camera so as to provide higher grip and stability whilst held aloft. Safety concerns and the inconvenience the product causes to others have led to them being banned at many venues, such as all Disney Parks, both Universal Studios Orlando, and Hollywood.Homemade selfie sticks may want to date again as early as 1925. A photo from that year shows a person taking a photo of himself and his wife, with the resource of a long pole that's pointed in the direction of the camera and out of frame.Amateur field cameras of the length would now not were capable of capture a selfportrait in cognizance when held at arm's length, requiring photographers to apply far flung shutter gadgets such as cables or sticks.A device which has been likened to the selfie stick appears in the 1969 Czechoslovak sci-fi film I Killed Einstein, Gentlemen. One character holds a silver stick in the front of herself and another man or woman, smiles at the stop of the stick as it produces a digital camera flash, and right now unfurls a printed photo of the pair from the stick's cope with. The 1983 Minolta Disc-7 camera had a convex reflect on its front to allow the composition of self-portraits, and its packaging confirmed the digital camera hooked up on a stick whilst used for one of these purpose. A "telescopic extender" for compact handheld cameras changed into patented with the aid of Ueda Hiroshi and Mima Yujiro in 1983, and a Japanese selfie stick become featured in a 1995 e book of "101 Un-Useless Japanese Inventions". While dismissed as a "vain invention" at the time, the selfie stick later gained worldwide popularity inside the 21st century.Canadian inventor Wayne Fromm patented his Quik Pod in 2005 and becoming commercially available inside the United States the following year.In 2012, Yeong-Ming Wang filed a patent for a "multi-axis omni-directional taking pictures extender" capable of keeping a phone, which gained a silver medal at the 2013 Concours Lepine. The term "selfie stick" did now not come to be broadly used till 2014. Extended kinds of selfie sticks can keep laptop computer systems to take selfies from a webcam. By the autumn of2015 technology news noted that there was a massive type of selfiesticks available at the market; Molly McCugh of Wired mag wrote in October 2015, "Some are very, very long; a few aren't so long; a few are bedazzled. Some seem like hands. Some are spoons. But they're all, on the cease of the day, one thing: A stick that takes selfies." The selfie stick become listed in Time magazine's 25 best inventions of 2014. While the New York Post named the selfie stick the most arguable gift of 2014. At the end of December 2014, Bloomberg News referred to that selfie sticks had ruled the 2014 vacation season as the “have to-have” gift of the year. The selfie stick has been criticized for its affiliation with the perceived narcissism and self-absorption of modern society, with commentators in 2015 dubbing the device the "Narcisstick” or "Wand of Narcissus". Despite numerous bans, selfie sticks proved so famous that a selfie stick shop become opened in Times Square all through the summer season of 2015. In 2016 it changed into reported that Coca-Cola had created a "selfie bottle" with an attached digicam that takes pix while it's far tipped for drinking. One is able to attach their device to the give up of the selfie stick and then make bigger it past the everyday reach of the arm. Different fashions of stick are brought on in numerous ways, along with pressing a button on the stick take care of which is connected to the device (normally using the jackplug), pressing a button on a wireless faraway (frequently thru Bluetooth), the use of the digicam's integrated timer, or making a valid the tool can detect to begin recording a video or taking a photo. The cellphone's physical way of triggering the digicam, which includes thesound quantity controls or the touchscreen digicam button of the tool, are replicated on headphones with on-twine controls. When selfie sticks are plugged into the jack plug, they're seen through the device as headphones. The selfie stick offers more sensible use in situations that require help fortaking photographs/videos at difficult angles that want to be taken from anextended, elevated distance past the arm’s reach. It allows the person totake photos and videos in in any other case dangerous or impossible conditions, which include recording footage inside a completely deephole, over a cliff, or definitely at an angle that is too some distance farawayfrom the person. Despite the selfie stick being considered one of the maximum famous gadgets among vacationers and families, bans and regulations on its use have been imposed across a range of public venues usually at the grounds of safety and inconvenience to others.Concert venues and some tune festivals inside the United States, Australia and the UK have banned the use of selfie sticks. Organisers have stated their role within the "illegal recording" of bands' sets, and the inconvenience and protection issues to fellow target market members. Museums, galleries and ancient web sites which includes the Palace of Versailles have banned the sticks because of concerns about viable harm to valuable artistic endeavors and different objects.Theme parks, together with Disneyland Resort, Walt Disney World Resort, Tokyo Disney Resort, Disneyland Paris, Hong Kong Disneyland, Shanghai Disneyland, Six Flags, Universal Orlando, and Universal Studios Hollywood have banned selfie sticks. The sticks have always been banned on rides at Disney World for protection reasons, however after a number of times in which rides needed to be stopped because of a guest pulling out a selfie stick in mid-ride, along with incidents on California Screamin' and Big Thunder Mountain Railroad, Disney issued a park-huge ban on the accessories.Sporting occasions have banned selfie sticks each for their "nuisance value" and for interfering with other spectators' enjoyment or view. The Australia Tour Down Under banned the gadgets citing "harm to cyclists, officials and yourself".Emirates Stadium, home of the Arsenal Football Club, bans "any object that could be used as a weapon or may want to compromise public safety", and regards selfie sticks as such an item.In 2014, South Korea's radio management company issued policies banning sale of unregistered selfie sticks that use Bluetooth era to cause the digicam, as any such device offered in South Korea is taken into consideration a"telecommunications tool" and must be tested via and registered with the agency. In 2015, Apple banned selfie sticks from a WWDC Developers Conference, although did not explicitly state why.