Product name: Bluetooth decoding boardProduct model: XY-WRBTWorking voltage: 3.7~24VDCBluetooth version: 5.0Transmission distance: 15m (visible and unobstructed)Signal to noise ratio: 90dBDistortion: - 70dBNumber of channels: dual channels (stereo)Audio interface: 3.5mm audio interfaceModule protection mechanism: power reverse connection protection1. -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" will be played, and the indicator light will be on for a long time to play mobile phone music, and the indicator light will 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:BlackMaterial:PCBPackage Contents:1 x Bluetooth5.0 decoding boardOnly 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.