Feature:1. 4 IN 4 OUT: 4 in and 4 out design, random combination, 4 ways can not be input at the same time nor output at the same time, each time only 1 way input, output 1 way.2. SILENT SWITCHING: Only the power supply control circuit, to get the silent switching effect, no thumping noise, no interference, no noise.3. GOLD PLATED RCA SOCKET: HiFi sound gold plated RCA socket, lower impedance, lossless HiFi PCB onboard and rear panel fixing, unplugging contact stability.4. RELAY SWITCHING: Independent switching control circuit, using relay switching, switching without noise, play in the switch smoothly without stuttering.5. LOSSLESS CONDUCTION: Switching does not interfere with the sound signal, input and output straight through, truly lossless conduction. Switching and conduction independent isolation, HiFi lossless transmission of sound signals, does not affect the sound quality in any way.Specification:Item Type: Sound SwitcherMaterial: Aluminum AlloyVoltage: 100240VSignal Format: Stereo 2.0 Signal L/RPort Type: RCA Red and White Socket (8 Groups of Sockets: 4 Inputs and 4 Outputs).Package List:1 x Sound Switcher1 x Adapter1 x Power Cable1 x Instruction Manual