TM400 Features:The TM400 stereo mixer has one 3.5mm input and four 3.5mm outputs, which can mix signals from CD players, musical inst ents, 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 power supply. It is portable and can be used anytime and anywhere. Four main output volume knobs and one independent input volume knob, four outputs do not interfere with each other. It can provide the highest sound quality even at the maximum output level. TX400 Features:The TX400 stereo mixer has four 3.5mm inputs and one 3.5mm output, which can mix signals from CD players, musical inst ents, portable recording devices, video playback devices, etc. The small and delicate passive circuit design will not enhance or reduce the audio signal. The TX400 can work without battery or external power supply, which is convenient to carry and use anytime and anywhere. One main output volume knob and four independent input volume knobs, four inputs do not interfere with each other. It can provide the highest sound quality even at the maximum output level. Colour:black Material:PCB+ acrylic Size: 83.5 x 54 x 21mm<br><br>Package Contents: 1 x Audio Mixer 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.