This Bluetooth-compatible amplifier board automatically enters pairing mode after powering on and searching for the display device name: SANWU Audio Specification: Origin: Mainland China Type: Voltage Regulator Condition: New Application: Speaker Model Number: TDA7492P 50W+50W Digital Amplifier Board Power supply: 2.1 interface DC 8-25V power supply Channel: 2 * 50w dual channel (stereo) Sound source input: Bluetooth-compatible connected stereo input, using CSR8633 Bluetooth-compatible chip, Bluetooth-compatible V4.0 Output impedance: 8 ohms (can drive 4,6,8,16 ohm impedance speakers) Output power: Add the previous stage NE5532 and the output power is sufficient Dip switch: It is more convenient to directly adjust the gain of the rear power amplifier, and better drive the horn with greater damping Color: blue/red (optional) Product size: 82 * 50 * 15mm/3.23 * 1.97 * 0.59in Packaging weight: 39g Note: Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! Please allow 1-2cm measuring deviation due to manual measurement. Included: 1 x Amplifier Board