Product name: 2.0 channel Bluetooth audio amplifier module Product : -XPSM Bluetooth version: 5.0 (unobstructed, 15 meters) Input : AUX+Bluetooth Number of channels: 2.0 channels (left channel + right channel) Amplifier chip: TDA7498E Adapter supply: DC12~32V (less than 9V undervoltage protection, 12V supply can also be supported) Adapter speaker: 30-200W, 4-8 ohm Output : left and right channels less than or equal to 150W Protection mechanism: anti-reverse connection, undervoltage, overheating, overcurrent, short circuit protection Colour: Black Material: plastic Size: 119 x 70 x 21mm Package Contents: 1 x 2.0 channel Bluetooth audio amplifier module : When the audio signal input is enough and the supply voltage/current is enough, there will be enough output ! The higher the supply voltage, the greater the output , and the smaller the speaker impedance, the greater the output ! Please make the of the adapter supply is greater than the actual working of the amplifier! Only the above package content, other products are not included. Note: Light 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.