Left and right channel output power: 12W+12W, it is recommended to use 2.5-4 inch, 4-8 Euro 10-30W full frequency speaker.

Bass output power: Speaker 4 ohms have 22W, it is recommended to use 4-6 inch, 4 Euro 20-50W bass speaker.

Power: DC DC12V, switching power supply, battery can be, it is recommended to use more than 3A current.

PCB material: FR-4 fiberglass board, thickness: 1.6mm.

Dimensions: 75x43x20mm (length x width x height), overall height.
  Board size: 75x43x25mm (length x width x height) without potentiometer handle length.

Potentiometer shaft center distance: 25mm potentiometer mounting hole diameter needs 7mm
  Input interface: 3.5mm port and a 3P socket with a spacing of 2.0mm