3X(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 functions can be matched to work. You cannot solder 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 2X15+30W 4ohm; 20V power supply maximum power 2X25+50W 8ohm

Product name: 2.1 channel subwoofer power amplifier board
Supply voltage: 12-20V DC
Supply current: 3-5A
Maximum power: 2*25W+50W 8ohm
Minimum power: 2*15W+30W 4-8ohm
Bluetooth version: 5.0
Channel: 2.1
Job type: Class D
Product size: 96x48mm
Colour:blue
Material:PCB+Metal

Package Contents:
1 x Bluetooth power amplifier board
1 x AUX audio cable
1 x USB cable)