Samson S-phone Headphone Mixer/Amplifier Two Master Stereo Inputs plus Stereo Link Output 8 Segment LED Metering on Each Channel and Master Three Headphone Outputs per Channel (One Front Panel and Two Rear Panel Outputs), Auxiliary Input with Balance Control provides four Channels of "More Me" Mixing Mute and Stereo/2 Channel Mode Switches and 2-Band EQ on Each Channel Maximum Output Power on Each Channel (Regardless of Headphone Impedance)