A77系列低功耗藍牙模塊 
Bluetooth technology is an open global specification for wireless data and voice communication. Its essence is to provide a universal wireless interface for device close connection. It is widely used in the field of mobile communication equipment and computer. Since the birth of Bluetooth 4.0, it has spawned a large number of smart devices, among which the key is the introduction of Bluetooth low power (BLE) technology. Compared with bluetooth, BLE technology has three major features: low delay, low power consumption and low throughput. Today, xiaobian has brought a product series using BLE technology -- A77
