Product Name: Mini 100W+100W Stereo Bluetooth Digital Amplifier Material: PCB+Metal Product model: -AP100L Bluetooth version: 5.1 Transmission distance: 15 meters (unblocked) Colour: Black Material: PCB+Metal supply: DC12-24V Number of channels: left and right dual channel (stereo) Adapter speaker: 20W-200W 4 8 Protection mechanism: reverse connection protection, short circuit protection, self-recovery overheat protection Unique function: support Audio-APP control Product size: 58 x 58 x 18mm Note: The output of the supply should be greater than the output of the amplifier, otherwise it will affect the sound quality 12V-8/12W+12W, 4/22W+22W 19V-8/28W+28W, 4/greater than 55W+55W 22V-8/37W+37W, 4/greater than 72W+72W 24V-8/72W+72W, 4/greater than 100W+100W Package Contents: 1 x amplifier board 1 x DC adapter 1 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.