Brand NEW! The PHA40 4-Channel Stereo Headphone Amplifier from Pyle-Pro is a compact and lightweight stereo headphone amplifier that allows up to 4 users to listen to the same audio signal. The amp has a stereo 1/4" input jack and a set of 4 stereo 1/4" outputs. Each output has its own level control knob, letting users set their ideal volume level individually. There is a red power LED to provide visual indication that the unit is receiving power. It operates on 12VDC power via the included power supply. Compact and lightweight design allows you to use the amplifier virtually anywhere The stereo 1/4" input jack and 4 stereo 1/4" outputs provide wide compatibility Each output has its own level control knob, letting users set their ideal volume level individually The red power LED provides visual indication that the amp is receiving power Operates on 12VDC power via the included power supply Number of Channels 4 Input Impedance 100 kOhms, Unbalanced Output Impedance 80 Ohms (Each Output) Input Level +15dBu Output Level 40mW @ 100 Ohms Gain 20dB/Channel Signal to Noise Ratio 90dB Total Harmonic Distortion (THD) 0.03% Connectors 1 x 1/4" TRS Stereo Input 4 x 1/4" TRS Stereo Outputs 1 x Power Input Power Requirements 12VDC, 150mA Dimensions (WxHxD) 4.07 x 1.18 x 2.24" (104 x 30 x 57mm) Weight 0.42 lbs (0.19kg) Package Weight 0.95 lb Box Dimensions (LxWxH) 7.1 x 5.0 x 2.5" - All international buyers are responsible for all tax, duties and/or customs fees.