1. No need for power supply design, direct plug and use, no loss of input and output signals, seamless switching. 2. This product is designed to select a common output device for switching between various stereo signal inputs. If there are two stereo signal sources (such as TV, MP3 player, CD player, video game, mobile phone, tablet, computer, record player), the device can output to a power amplifier or active speaker. 3. Dual stereo source switcher eliminates the need for frequent cable swapping. Simply connect all input devices to the switcher and easily select the desired source. 4. RCA interface design for both input and output, with a manual push-button switch for precise 2-position selection. Power supply: No external power required, plug and play Frequency response: 20Hz - 20kHz Distortion: Less than 0.002% Insertion loss: Less than 0.01dB Signal gain: 0dB Signal-to-noise ratio (SNR): Greater than 98dB Input channels: 2 stereo input sources Output channels: 1 stereo output channel Dimensions: 69mm x 43mm x 39mm Color: Black Material: Metal Package Contents: 1 x o source signal selector Note: Light shooting and different displays may cause slight color variations between the image and the actual item. Measurement allows an error of +/- 1-3cm.