No power supply and other software required; plug and play. Compact design, easy to place, suitable for desktop and office use. The passive RCA switch features sturdy construction, sleek appearance, and thoughtful design. Compatibility: Works with legacy systems such as game consoles, CD players, DVD players, TVs, DACs, tape players, tuners, tube amplifiers, digital power amplifiers, and headphone amplifiers. Any device with left/right audio channels is compatible. Specifications: Interfaces: 5 x R/L Jack Knob: 1 x Selector Knob Analog signal maximum support: 1.2V p-p I/O Input/output frequency range: 20Hz20kHz Instructions for Use: 1. Easily switch between four L/R analog audio sources to one L/R analog amplification device. 2. Route one L/R analog audio source to four different L/R analog amplification devices, allowing flexible switching. Color: Black Material: ABS Size: 10.8 x 9.2 x 4.1 cm Package Contents: 1 x Stereo Audio Switch Note: The package includes only the items listed above. Other accessories are not included. Lighting and display differences may cause slight variations in color between the image and the actual product. Measurement error allowance: 13 cm.