2.1 channel amplifier board description: 1. The remote control, U disk, and AUX terminals have been connected to the Bluetooth amplifier board. The corresponding plugs must be inserted and the line functions can be matched to work. You cannot solder lines yourself, and there is a risk of burning the Bluetooth chip. 2. and supply: regulated switching supply: up to 20V; 12V supply maximum 2*15+30W 4; 20V supply maximum 2*25+50W 8 Product name: 2.1 channel subwoofer amplifier board Supply voltage: 12-20V DC Supply current: 3-5A Maximum : 2*25W+50W 8 Minimum : 2*15W+30W 4-8 Bluetooth version: 5.0 Channel: 2.1 Job type: Class D Product size: 96 x 48mm color:Blue Material:PCB+Metal Package Contents: 1 x Bluetooth amplifier board 1 x remote control Only the above package content, other products are not included. Note: Light 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.