5 things about Bluetooth you may not know yet

Bluetooth has long been a technology used to wirelessly pair two technology items together. Over time, this technology has changed, becoming better and better. However, there are still some "old-fashioned" mysteries around Bluetooth that are not well understood by everyone.

Bluetooth is much different today than Bluetooth of many years ago. Here are some common misunderstandings that people still think about Bluetooth, synthesized from Makeuseof page.

1. Turn on Bluetooth to drain the battery

Turning on and holding the Bluetooth in active state does not drain the battery. In the past, turning on Bluetooth was a real waste of battery life, because once activated, it will always actively find devices to pair at anytime, anywhere.

But now you can forget about that. With the new Bluetooth standards from version 4 onwards, we have a module called Low Energy .

The LE module uses other technologies to search for Bluetooth devices around you without using as much energy as previous Bluetooth versions.

Turning on and holding the Bluetooth in active state does not drain the battery.

On the other hand, once a connection is made, a LE device will not consume energy when not transmitting data. For example, if you pair a smartphone with a pair of "good" Bluetooth headphones, it will not drain the battery when not playing music.

As a result, Bluettoh LE's overall energy consumption has been reduced by more than half compared to before. While classic Bluetooth uses 1W, Bluetooth LE only uses 0.01 to 0.5W only!

2. Bluetooth is not good for health

At this point, there is no definitive evidence that radiation from mobile phones negatively affects your health. However, we know one thing: Bluetooth devices are much safer for yourself .

Radiation is related to energy, and Bluetooth excels at that point. A Bluetooth Class 1 device only emits up to 100mW (milliwatt) of energy, which actually rarely reaches that level.

In fact, most Bluetooth devices you use have a maximum power level of only 1mW. On the other hand, regular phones operate at 1,000mW or 2,000mW when you use 3G and 4G services.

Therefore, although Bluetooth is not absolutely safe, wearing a Bluetooth headset is obviously safer than contacting a smartphone.

3. Bluetooth only works in small rooms

It is probably true that Bluetooth on your smartphone only works in short range.

Bluetooth on your smartphone only works in short range?Probably right . But what you don't know is that Bluetooth has three classes, and its operating distance depends on different classes:

• Bluetooth Class 3 devices have a range of less than 10m.
• Bluetooth Class 2 devices have a range of about 10m.
• Bluetooth Class 1 devices have a range of about 100m.

In general, you will only see Bluetooth Class 1 on devices that have their own power source, or have a large electrical storage unit, such as a desktop or wired speaker. Most smartphones and tablets use Bluetooth Class 2 or 3.

However, 10m is the theoretical distance they are directed at. If there is nothing obstructing, like a wall, you will find that the actual distance is slightly higher than the theory.

4. Bluetooth "not detected" has a high level of security

Bluetooth security is complex, whether you set it to "undetectable (non-discoverable)" or not solve the problem.

Bluetooth technology has never been known for security, but recent versions have overcome quite a number of vulnerabilities. It's funny to think that, if you put the device in "undetectable" mode , people with malicious intent can't find it and you'll be safe.

Scanning and detection devices can still detect your BDA and invade even if your device is in undetectable mode.

That of course is not true.

Bluetooth Device Address (BDA) may be hidden in undetectable mode, but hackers have gained it over the years. Scanning and detection devices can still detect your BDA and invade even if your device is in undetectable mode.

The biggest criminals that lead to compromised devices are the default passwords used on most Bluetooth devices: 0000 or 1234. Because of this, anyone can connect to your device. when you have the device address.

This system is designed scientifically as the cause of most cases of eavesdropping and Bluejacking (who connect bluetooth to a phone to send spam messages) on Bluetooth devices. Therefore, the first thing you need to do now is go to the Bluetooth settings on your phone and change the default password to a 4-character security PIN.

If you're really worried about a malware attack via Bluetooth, turn off Bluetooth instead of leaving it undetectable (non-discoverable). Bluetooth cannot be compromised if it is turned off.

5. Bluetooth obstructs Wi-Fi

Like most wireless technologies, Bluetooth uses 2.4GHz radio frequency to send and receive signals. This frequency coincides with the frequency used by many other things (actually everything), from the Wi-Fi network to your microwave.

Therefore, it is obvious that your first thought will be the stability and speed of the Bluetooth connection depending on the operation of the surrounding devices, and whether they are broadcasting data on wireless frequencies. above or not.

Bluetooth itself can accommodate extremely fast frequency hopping to keep the connection stable without slowing down.

Not really true.

Bluetooth uses a so-called "adaptive frequency hopping" and it has been greatly improved with Bluetooth 5.0. Let's learn about it a bit.

2.4GHz frequency is a frequency band running from 2,400MHz to 2,483.5MHz. Bluetooth uses two channels, each monitoring 50% of the band. The signal jumps quickly from a free frequency to another frequency, thus ensuring it is not interrupted by other devices trying to use that band.

As a result, while other wireless connections can find ways to use the same frequency that Bluetooth is using, Bluetooth itself can perform extremely fast frequency hopping to keep the connection stable without slowing down. .

Summary: Bluetooth is a comfortable and secure technology for wireless connection between devices. Feel free to use it, especially with Bluetooth 5.0 integrated technology items, without having to worry about your battery life.