Compact 4-channel stereo headphone amplifierCan be used for up to four headphones at the same time thomann . for simultaneous listening of main mix with separate volume control. Comes with four powerful stereo amplifiers that deliver outstanding performance at any volume. Clear sound with ultra low-noise 4580 operational amplifiers that are used in 19inch studio equipment. Separate volume control for each channel 1 Input with 6.3 thomann mm stereo jack Input impedance 100 Ohm 4 outputs with 6.3 mm stereo jakcs Output impedance 80 Ohm Plug Type: US Plug, it applies to Canada, India, Mexico, Thailand, Taiwan, the , the Philippines and so on. Voltage: AC100-240V Colour:black Material:Metal Size:109 x 51 x 58mm Package Contents: 1 x 4-way headphone amplifier 1 supply Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.