Note: When the audio signal input is enough and the supply voltage/current is enough, there will be enough output ! The higher the supply voltage is, the greater the output is. The smaller the horn impedance is, the greater the output is. Please the of the adaptive supply is greater than the actual working of the amplifier Product name: 2.0 channel Bluetooth audio amplifier module Product : -XPSM Bluetooth version: 5.0 (unshielded, 15m) Input mode: AUX+Bluetooth Number of channels: 2.0 channels (left+right) Adaptive supply: DC12~32V (lower than 9V under voltage protection, 12V supply can also be supported) Adaptive horn: 30-200W, 4-8 Ω Output : 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: 1 x Bluetooth audio amplifier board 1 x Screwdriver Only the above package content, other products are not included. Note: Light reflection and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.