You get that important call you’ve been waiting for, and you scramble for earphones in your bag. You groan as you find them, wires all a-tangle like yesterday’s spaghetti. And then, when you try to transfer photos from the phone to your computer, you can’t find that elusive USB cable in your desk.
Sound familiar? No? That’s because you’re using Bluetooth to connect your earphones, your phone, and your computer—no wires, no fuss. But do you know how Bluetooth makes your life so much easier?
Bluetooth—named for a 10th-century Danish king, incidentally—uses radio waves to transmit information between two devices directly. The radio waves used by Bluetooth are much weaker than those involved with Wi-Fi or cellular signals, two other common ways to connect devices. Weaker radio waves mean that less power is being used to generate them, which makes Bluetooth a particularly useful technology for battery-powered devices. Those weaker radio waves also mean that Bluetooth typically works only over short distances, of less than 30 feet, or about 9 meters. (Incidentally, long-range Bluetooth devices do exist, but they either require power not usually seen in the commercial domain or are products of precision engineering that exists only in prototypes.)But a Bluetooth connection between two devices will stay active as long as they remain within range, without the need for a router or any other intervening device.
When Bluetooth-enabled devices are close to each other, they automatically detect each other. Bluetooth uses 79 different radio frequencies in a small band around 2.4 GHz. This band is used by Wi-Fi too, but Bluetooth uses so little power that interference with Wi-Fi communication is negligible. When two devices are being paired, they randomly pick up one of the available 79 frequencies to make a connection, and, once that connection is established, they keep hopping across these frequencies many times a second. The connection will automatically break if the devices move too far apart, and they’ll reconnect once they come within range again. Security can be applied too: devices can be configured to accept connections only from “trusted devices,” and passwords can be used to block malicious actors.
All of this means that you can think of Bluetooth as a bit like a duck swimming in a placid lake. There’s a lot of churning under the surface, as connections are made and broken and renewed so that data can flow, but on the surface everything looks calm and effortless. No drama. No wires.
Bluetooth devices communicate via short-range radio transmissions on the 2.4 GHz frequency range. The 2.4 GHz frequency range offers numerous channels that Bluetooth devices can take advantage of for communication.
Bluetooth uses a radio technology called frequency-hopping spread spectrum, which chops up the data being sent and transmits chunks of it in the frequency range of 2,400-2,483.5 MHz. This range is the globally recognized Industrial, Scientific and Medical short-range radio frequency band.
Bluetooth is a short-range wireless technology that uses radio waves to connect devices. It does not require an internet connection to work. This means that you can use Bluetooth to connect devices even if you are in an area with no WiFi or cellular coverage.
Bluetooth allows for short-range data transfer between devices. As an example, it is commonly employed in headsets for mobile phones, enabling hands-free phone use. Wi-Fi, on the other hand, allows devices to connect to the Internet.
While some devices use a level of Bluetooth encryption that can protect your devices and data, others operate on open frequencies. If hackers can intercept (or hack) your connection, they can also intercept data (such as passwords and credit card numbers), take over your devices, or spy on you.
A lot of people still don't know what Bluetooth is and how it differs from wi-fi, so here's a basic explanation: Bluetooth technology is built into electronic gadgets and allows them to connect directly with each other wirelessly. Bluetooth devices transmit data using low-powered radio signals.
Every Bluetooth finder has an antenna that allows it to communicate all the information from the chip with the mobile devices the finder is registered to, through a radio-based link.
Wireless models are safest, but only when connected via Bluetooth. This is because they only draw power from their internal battery; with no additional power they can only get so loud. Though Bluetooth is by no means convenient when you have kids, it's safer.
While Bluetooth is beneficial for many applications, be careful how you use it. My advice: Turn off Bluetooth when you're not using it. Keeping it active all the time makes your device more discoverable. As a bonus, keeping Bluetooth off will increase your device's battery life.
No, Bluetooth does not make use of cellular data in order to function. Instead, it uses radio waves to connect devices. As a result, Bluetooth can work even if you don't have an Internet connection or cellular service.
It does not cost anything, it is a short range communication protocol and does not use your data plan. If you make devices and want to implement bluetooth functionality: Yes. There are licensing and certification fees that your project needs to budget for.
While your Android device might be a little different to the one on screen, the steps to turn off Bluetooth will be similar. To turn off Bluetooth, open Settings, locate Bluetooth, swipe to turn Bluetooth off. Bluetooth is now turned off.
Limited range: Bluetooth connections typically become weaker or lost when the devices are more than 10 meters apart. Lower transfer speeds: Bluetooth may have slower data transfer rates than USB or Wi-Fi technologies.
Bluetooth's special feature is creating a direct link between two devices. This means it can work perfectly fine without Wi-Fi: Because Bluetooth doesn't rely on Wi-Fi, it's super flexible. It can work just about anywhere, even places without reliable Wi-Fi.
The human body is mostly water, and bluetooth is, after all, the same frequency of your microwave oven, which uses 2.4GHz because it's in a band of frequencies from 1-20GHz that water absorbs. When you're indoors, you don't need to get bluetooth through your body.
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