Product Description: Four input channels for you to blend various audio sources or instrument down into one channel. You can mixing guitar, electronic drum, MP3 player, phone music together then enjoy the reverb you've made.No hum hissing and audible noise added into the system, pretty transparent, fluent sound streaming, 8 channels stereo mixer give the nice and pleasure experiences when you are using. The audio mixer 8 channel has four 1/4 TRS inputs along with an 1/4 TRS output, the channels are stereo not mono.Four volume knobs of stereo mixer led on the front panel to adjust each input level.Please add a ground loop noise isolator on the line from your computer and into the mixer if there is humming bzzing noise when mixing the computer and other device audio. Specification: - Color：black -Material：Metal -Net Weight: Ib / KG -Package dimensions：6.9（L）x 5.9(W) x 2.95(H) inch / 17.5 15 7.5CM Package included: 1 xMoukey MAMX3 1 xUSB power cable 1 xManual.