TM400 Features:The TM400 stereo mixer has one 3.5mm input and four 3.5mm outputs, which can mix signals from CD players, instruments, portable recording devices, video playback devices, etc. The small and delicate passive circuit design will not enhance or reduce the audio signal. The TM400 can work without battery or external supply. It is portable and can be used anytime and anywhere. Four main output volume knobs input volume knob, four outputs do not interfere with each other. It can the highest sound quality even at the maximum output level. Colour:black Material:PCB+ acrylic Size: 83.5 x 54 x 21mm Package Contents: 1 x Audio Mixer Only the above package content, other products are not included. Note: Light reflection and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.