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 Bluetooth mode. After broadcasting the "prompt tone", it enters pairing mode and waits for pairing. Mobile phone Bluetooth searches for "XY-WRBT" (amplifier board device name), click "XY-WRBT" to connect. After the connection is successful, "prompt tone" will be played, and the indicator light will stay on. When playing mobile phone music, the indicator light will flash slowly. After the Bluetooth connection is disconnected, the amplifier board is ready for the next pairing. After playing the "prompt tone", it enters pairing mode to wait for pairing. Color: Black Material: PCB Package Contents: 1 x Bluetooth 5.0 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 to be slightly different from the real thing. The measurement allowed error is +/- 1-3cm.