Introduction This is a compact and cost-effective Bluetooth 5.0 audio receiver module that supports automatic reconnect function. It can be powered by a micro USB or 3.7V lithium battery. You can easily convert your old speakers into wireless Bluetooth speakers with this module. If you short circuit the Sound Card pads on the back of the module and connect the board to a computer via USB cable, you can use it as a Sound Card. Operating Instruction After the power is switched on, the blue light flashes and the module enters Bluetooth mode. After playing the audio prompt, it goes into the pairing mode, waiting for pairing; Turn on the Bluetooth of a phone, BT5.0-Audio(module Bluetooth name) will be searched and displayed, click BT5.0-Audio to connect to the board. The connection succeeds after playing audio prompt. When the indicator is always on, you can play your music on the phone, and the indicator keeps slowly blinking when playing music. Scenario Note 1. Since there is no lithium battery protection circuit on the decoder board, it is recommended to use this module with a Lipo Charger board. 2. Pay attention to the electrostatic protection. Since the Bluetooth chip is very sensitive to static electricity, you must discharge the static electricity on your hand to avoid causing damage to the chip when touching it with a bare hand. 3. Bluetooth antenna signal is easy to be influenced by high-frequency or strong electromagnetic signal, so please try to keep the module away from radio transmitting devices, and this board should not be placed close to any metal objects.