Note: When the audio signal input is large enough and the power supply voltage/current is large enough, there be enough output power! The higher the power supply voltage is, the greater the output power is. The smaller the horn impedance is, the greater the output power is. Please that the power of the adaptive power supply is the actual working power of the power amplifier Product name: 2.0 channel Bluetooth audio amplifier module Product model: -XPSM Bluetooth version: 5.0 (unshielded, 15m) Input mode: AUX+Bluetooth Number of channels: 2.0 channels (left+right) Adaptive power supply: DC12~32V (lower than 9V under voltage protection, 12V power supply can also be supported) Adaptive horn: 30-200W, 4-8 Ω Output power: left and right channels ≤ 150W Protection mechanism: protection against reverse connection, undervoltage, overheating, overcurrent and short circuit Product size: 119 x 70 x 21mm Material: PCB+Metal colour: Black Package Contents: 2 x Bluetooth audio amplifier board 2 x Screwdriver 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.