Product Feature: This stereo passive mixer has 4 channels RCA input and 1/2 channel RCA output.Each channel can be adjusted volume individually. Made of high quality metal, sturdy and durable. With anti-slip mats in the bottom, stable to use. Mini size, portable and lightweight. The stereo passive mixer works without batteries or external power supply, and is easy to carry and use any time, anywhere. Mini passive stereo mixer is a 4 passive mixer for extended control of tuning, mixing instrument, CD player, tape player, computer, mobile phone, tablet and so on. Mini mixer produces the highest sound quality at all output levels, ultra low noise operational for outstanding sound performance. Distortion free and easy to set up. Product Description: KJY-CX400 Size: Approx.8.5x8.2x4cm/3.34x3.22x1.57in Input Impedance: 10K ohms to 47K ohms Output Impedance: 2.5k ohms to 10k ohms Gain: - 12dB max. Material: plastic+metal colour: black Package Contents: 1 x Stereo Passive Mixer(KJY-CX400) 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.