No power supply and other software required; plug and play. Compact easy to place and suitable for your desktop and office. The passive switch has a sturdy construction, beautiful appearance and reasonable design. Compatibility: Used for Legacy Systems Game Console/ CD Player/ DVD/ TV/ / TAPE/ TUNER/ Tube Amplifier/ Digital Power Amplifier/ Headphone Amplifier. Any device with L/R Sound Channel is compatible. Specification: 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: 20Hz~20KHz Instructions for Use: 1. It can easily switch four L / R analog sound signal sources to one L / R analog signal amplification device. 2. It can also assign one L / R analog sound signal source to four L / R analog signal amplifying devices, allowing you to switch easily. colour: black Material: ABS Size: 10.8x9.2x4.1cm Package Contents: 1 x Stereo Audio Switch Only the above package content, other products are not included. Note: Light reflection 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.