Product Name: Subwoofer Power Amplifier Board Supply voltage: 12-24V DC Supply current: 3-5A Maximum power: 24V 30W 8ohm Minimum power: 12V 20W 8ohm Bluetooth version: 5.0 Channel: Mono Type of work: Class D Product size: 96x48mm Power amplifier board power and power supply description: 1. The power supply of this power amplifier board requires 12-24V3A DC regulated switching power supply (battery and charger, transformer and AC switching power supply test are not guaranteed) 2. 12V3A (above) power supply, the maximum output power is 20W 8 ohms. It can be connected to 20W bass + 5W treble (full volume may be distorted) 3. 24V3A power supply, the maximum output power can reach 30W 8 ohm continuous power! It can be connected to 30W bass + 10W treble (connected to 4 ohm speakers may protect) (it may also be protected after all volume is turned on) Colour:black+green Material:PCB+Metal Package Contents: 1 x Bluetooth power amplifier board 1 x DC female cable 1 x AUX cable 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.