Please use a linear power supply, the ripple is small, and it is not easy to generate hum.Stereo o two-way input four-way output, can directly push four headphones or external power amplifiers do not affect each other, power supply: the nification is about 5 times, the potentiometer controls the volume of each output separately.Using the high-current op amp NJM3414A from Japan JRC, the maximum output current is 70ma, which can provide good large dynamic fidelity output.colour:blackMaterial:plasticsize:128x53mmPackage Contents:1 x Stereo MixerOnly the above package content, other products are not included.Note: Light shooting 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.