No power supply and other software required plug and play. Compact easy to place and suitable for your desktop and office. The passive RCA switch has a sturdy construction, beautiful appearance and reasonable design. Compatibility: Used for Legacy Systems Game Console or CD Player or DVD or TV or DAC or TAPE or TUNER or Tube Amplifier or Digital Power Amplifier or Headphone Amplifier. Any device with L or R Sound Channel is compatible. Specification: Interfaces: 5 x R or L Jack Knob: 1 x Selector Knob Analog signal maximum support 1.2V p-p I or o Input or output frequency range: 20Hz-20KHz Instructions for Use: 1. It can easily switch four L or R analog sound signal sources to one L or R analog signal amplification device. 2. It can also assign one L or R analog sound signal source to four L or 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.