This audio mixer supports 4 input to 1 output, and each channel can be individually controled by the potentiometer. It can directly drive the headphones or connect the amplifier which interface is 3.5mm stereo socket. If you are interested in this product, come and have a try, it will not let you down.

Specifications:
Material: metal
Input&output: 3.5mm
Magnification: about 2 times
Quiescent current: about 15 mAh
Item size: 110 * 60 * 27mm / 4.3 * 2.4 * 1.1in
Item weight: 117g / 4.1ounce
Package size: 130 * 110 * 40mm / 5.1 * 4.3 * 1.6in
Package weight: 150g / 5.3ounce

Packing List:
1 * Audio Mixer