1. No need for power supply design, direct plug and direct use, no loss of input and output signals, switching mission,2. This product is mainly used to select a common output device for switching various stereo signal input. If there are two stereo signal sources (such as TV o, MP3 player, CD player, video game, mobile phone, tablet, computer, record player), the device needs to output to the power amplifier or active speaker.3. Two sets of stereo source switchers solve the complex line plugging operation. As long as the required input device signal source is uniformly connected to the switcher, it can be easily selected.4. RCA interface design is used for product input and output standards, and the switch is designed with manual push-button switch of precise 2 positions. Power supply: no power supply, plug in and use directlyFrequency response: 20-20 kHzDistortion: Less than 0.002%Insertion loss: Less than 0.01dBSignal gain: 0dBSNR S/N: more than the 98dBNumber of input channels: 2 stereo input signal sourcesNumber of output channels: 1 channel stereo outputsize:69mm x 43mm x 39mmcolour: blackMaterial: metal Package Contents:1 x Audio source signal selector Only 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.