4-channel headphone amplifier.

Input Connections: 2x 6.3mm Balanced Jack / 1 3.5mm Stereo Jack
Output connections: 4x 6.3 mm Stereo Jack / 1x 3.5 mm unbalanced Jack
Controls: Master Volume, Channel Volume (4x), Mute (Master), Mono (Master)
Frequency response: 17 - 47,000 Hz
Output power: 282 mW per side / 564 mW per channel
Power supply: 15V DC