2.1 channel power amplifier board description: 1. The remote control, U disk, and AUX terminals have been connected to the Bluetooth power amplifier board. The corresponding plugs must be inserted and the line functions can be matched to work. You cannot solder the end lines yourself, and there is a risk of burning the Bluetooth chip.2. Power and power supply: regulated switching power supply: up to 20V; 12V power supply maximum power 2*15+30W 4; 20V power supply maximum power 2*25+50W 8 Product name: 2.1 channel subwoofer power amplifier boardSupply voltage: 12-20V DCSupply current: 3-5AMaximum power: 2*25W+50W 8Minimum power: 2*15W+30W 4-8Bluetooth version: 5.0Channel: 2.1Job type: Class DProduct size: 96 x 48mmcolor:BlueMaterial:PCB+Metal Package Contents:1 x Bluetooth power amplifier board1 x remote control Only the above package content, other products are not included.Note: Light shooting 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.