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 console, mobile phone, tablet, computer, or record player), this device allows output to a power amplifier or active speaker. 3. Dual stereo source switcher simplifies complex cable swapping. Simply connect the required input devices to the switcher for easy selection. 4. RCA interface design is used for input and output connections, with a manual push-button switch featuring precise 2-position selection. Power supply: No external power required, plug and play Frequency response: 20 Hz - 20 kHz Distortion: Less than 0.002% Insertion loss: Less than 0.01 dB Signal gain: 0 dB Signal-to-noise ratio (S/N): Greater than 98 dB Number of input channels: 2 stereo input sources Number of output channels: 1 stereo output channel Dimensions: 69mm x 43mm x 39mm Color: Black Material: Metal Package Contents: 1 x Audio source signal selector Note: The package includes only the items listed above. Other products are not included. Note: Lighting and display differences may cause slight color variations between the image and the actual item. Measurement may vary by +/- 1-3 cm.