When it comes to Bluetooth technology, I believe most people's first reaction is Bluetooth headset. Of course, Bluetooth headset is the first Bluetooth device introduced to people. By using Bluetooth technology in the hands-free headset, users can experience the trouble of no wire for the first time.

In recent years, with the rapid development of smart phones, wearable devices and the Internet of things, and the popularity of TWS Bluetooth headsets in recent two years, the development of Bluetooth industry has also entered a fast lane. On April 15, Bluetooth Technology Alliance released the latest Bluetooth market information in 2021. The report predicts that although the growth of Bluetooth market has slowed down in the past year, However, the annual shipment of Bluetooth devices is expected to increase from 4 billion units in 2020 to more than 6 billion units in 2025.

Interestingly, the word Bluetooth comes from the name of King Harald of Denmark in the 10th century. It was Jim kardach, an Intel engineer, who linked Bluetooth to later wireless standards. He proposed Bluetooth as the name of wireless technology standard at a wireless communication industry conference. In 1998, Ericsson joined IBM, Intel, Nokia and Toshiba to form the predecessor of the Bluetooth technology alliance.

But what people didn't realize at that time was that the scope of use of the blue sign would far exceed their expectations. From wireless headphones for audio and games to smart furniture, wearable devices, and even Apple's "bit by bit" function, Bluetooth is undoubtedly the most mainstream and convenient mainstream technology at present.

But the early Bluetooth technology is really difficult to use. Not only the transmission rate is not high, but also the security problem. In the 4.0 era, Bluetooth transmission technology has been greatly improved. It is also the first Bluetooth integrated protocol specification that integrates the three specifications. The most important change is the low-power function of ble, which puts forward three modes: low-power Bluetooth, traditional Bluetooth and high-speed Bluetooth.

After entering the 5.0 era, Bluetooth technology has completely opened the door of the Internet of things era. In low-power mode, Bluetooth technology has faster and longer transmission capability. The transmission rate is twice that of Bluetooth 4.2 (the maximum speed is 2Mbps), the effective transmission distance is four times that of Bluetooth 4.2 (theoretically 300m), and the packet capacity is eight times that of Bluetooth 4.2. It supports indoor positioning and navigation function, and can realize indoor positioning accuracy of less than 1m in combination with WiFi. At the same time, the underlying optimization of the Internet of things will strive to serve the smart home with lower power consumption and higher performance.

In other words, someone here may want to ask, Bluetooth technology was born so long, and now wireless technology is developing so fast, why do you still use Bluetooth?

In fact, Bluetooth does have two competitors that can not be ignored: Wi Fi and NFC.

First, let's look at NFC (near field communication technology), which is characterized by simpler connection form. You can connect by tapping a device that supports NFC. It is especially suitable for short-distance point-to-point connection with low power consumption. However, its disadvantage also lies in the distance. It needs about 4cm contact to realize transmission. Compared with the effective transmission distance of Bluetooth 5.0 300m, it is a little too large. At present, NFC usually plays the role of "bridge". Android devices often use NFC as a way of Bluetooth authentication, so that users can connect directly through contacts without cumbersome pairing.