Bluetooth is indeed one of the most widely used wireless communication protocols currently. It is mainly used for data transmission between short-range devices, such as headphones, mice, mobile communication devices, etc. The widespread application of Bluetooth technology has made the connection between these devices more convenient and efficient. 面对市面上设备形形色色的蓝牙技术版本，到底该如何选择呢？是版本越新越好吗？ 5.0以下：过于“古早”，建议弃用 蓝牙1.0~3.0，被称为“经典蓝牙”，第一个版本推出于1999年。它的特点是一度有着不错的传输速率（3Mbps），但是由于功耗过大，很难满足移动终端和物联网的需求而迅速被淘汰。 蓝牙 1.0 比我们现在的速度慢得多。数据传输速度上限为 1 Mbps，传输距离最远也只有 10 米。

Nowadays, in the constantly changing field of technology, we are increasingly relying on wireless connectivity. Nowadays, almost all of our small tools communicate through air, and the era of small cables is long gone. There are many wireless standards, but the most popular, widespread, and well-known one may be Bluetooth. This wireless standard connects various electronic products, from headphones and speakers to game controllers and smart home accessories. In this article, we will focus on introducing the latest version of the standard - Bluetooth 5.4, and every new feature it brings. But before we discuss the details, let's briefly explain the essence of Bluetooth.