Feature:1. The module has the characteristics of anti-reverse connection, wide voltage operation, automatic return connection, lithium battery rechargeable, etc.2. Use Bluetooth 5.0 signal to stabilize the sound quality, with good performance.3. Power supply can use Micro‑USB mobile phone charger, 3.7‑4.2V lithium battery. 3.7‑24V DC power supply, you can choose one of the three.4. Short‑circuit the "on/off contact" for 2 seconds to set the decoder board on/off.5. For battery-powered situations, shutting down when not in use saves power and facilitates modification.Specification:Item Type: Bluetooth Audio Receiver BoardMaterial: PCBPurpose: Bluetooth 5.0 decoder boardWorking Voltage: 3.7-24VDCBluetooth Version: 5.0Transmission Distance: Approx. 15meter / 49.2ft (visible without obstruction)Signal To Noise Ratio: 290dBDistortion: ≤70dBNumber Of Channels: Dual channel (stereo)Audio Interface: 3.5mm audio interfaceModule Protection Mechanism: Power reverse connection protectionRemote Control Battery Type: CR2025 (not included)How To Use: 1. After the power is turned on, the blue indicator light flashes quickly and enters the Bluetooth mode;2. After broadcasting the "prompt tone", enter the pairing mode and wait for pairing;3. "XY-WRBT" (the name of the power amplifier board device) is found in the Bluetooth of the mobile phone.4. Click "XY-WRBT" to connect. After the connection is successful, the "Prompt Tone" indicator will be on and the mobile phone music can be played. The indicator flashes slowly when the music is played;5. After the Bluetooth is disconnected, the power amplifier board is prepare for the second pairing, and after playing the "prompt tone", it enters the pairing mode and waits for pairing..Package List:1 x Module1 x Remote Control