Product name: Bluetooth decoding board Product model: XY-WRBT Working voltage: 3.7~24VDC Bluetooth version: 5.0 Transmission distance: 15m (visible and unobstructed) Signal to noise ratio: ≥ 90dB Distortion: ≤ - 70dB Number of channels: dual channels (stereo) Audio interface: 3.5mm audio interface Module protection mechanism: power reverse connection protection 1. Micro-USB mobile phone charger, 3.7-4.2V lithium battery and 3.7-24V DC power supply can be used for power supply. 2. Short circuit the "on/off contact" for 2 seconds to set the decoding board on/off. For battery power supply, it is more power saving to turn off when not in use, which is convenient for modification. Operating instructions: After the power is turned on, the blue indicator flashes quickly to enter the Bluetooth mode; After broadcasting the "prompt tone", enter the pairing mode and wait for pairing; Mobile phone Bluetooth searches for "XY-WRBT" (power amplifier board device name), click "XY-WRBT" to connect, after the connection is successful, "prompt tone" be played, and the indicator light be on for a long time to play mobile phone music, and the indicator light flash slowly when playing music; After the Bluetooth connection is disconnected, the amplifier board is ready for pairing, and after playing the "prompt tone", it enters the pairing mode to wait for pairing. color:Black Material:PCB Package Contents: 2 x Bluetooth5.0 decoding board Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.