• Works voltage: has AC110V or 220V two kinds for choose
• This remote volume control board with 128-steps relay pure resistors shunt control, all resistors use American DALE precision resistors, 4 way of input for choose.
• This board has a power-off memory function, which means that it can return to the state before the last shutdown every time it is turned on.
• It has a one-button return volume function. The customer can set the return volume, which means that the volume can be adjusted back to the volume set by pressing the one button at any time (press the "SET" button on the remote control, The display flashes and press the volume button to set the desired setting volume and press the SET button to save.)
• It support One button mute, remote and hand control volume.remote and hand choose inputs. remote and hand control power on/off.
• Remote volume control board encoder installation distance 220mm.
• RCA installation size: input RCA distance 20mm*20mm, 4th RCA and audio output RCA distance 30mm. as following photo:

• 1 × Control board
• 1 × Input choose & relay board (with RCA sockets)
• 1 × Power supply board
• 1 × Remote control (without battery)
• 1 × 5P cable
• 1 × 8P cable