1 It can easily switch four L / R analog sound signal sources to Two L / R analog signal amplification device. 2 It can also assign Two L / R analog sound signal source to four L / R analog signal amplifying devices, allowing you to switch easily 3.No power supply and other software required; plug and play. 4.Compact easy to place and suitable for your desktop and office. 5.Analog signal maximum support 1.2V p-p I/o 6.Input/output frequency range: 20Hz~20KHz 7.The passive RCA switch has a sturdy construction, all metal, beautiful appearance and reasonable design.