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 directly Frequency response: 20-20 kHz Distortion: Less than 0.002% Insertion loss: Less than 0.01dB Signal gain: 0dB SNR S/N: more than the 98dB Number of input channels: 2 stereo input signal sources Number of output channels: 1 channel stereo output size:69mm x 43mm x 39mm colour: black Material: 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. Product Notes: Please allow a little manual errors.Due to the lighting of the photos and the difference of monitors, the pictures may not reflect the actual color of the real item. Please confirm acceptance before ordering. About Shipping: Please ensure your shipping informations are correct to avoid delivery issues. All orders are shipped within 3 days after payment. Delivery usually takes 8–12 days, The specific delivery time is depend on circumstances. If you have any questions during your purchase, feel free to contact us. We will respond you within 24 hours.