Feature: 1. Active Power Supply: 4 in 1 out RCA switcher using active power supply, switching silent no sound, excellent listening sense more preservation of the output device. 2. Lossless Signal: 4 in 1 out RCA switcher can 100 percent full lossless signal input and output, true full lossless switching (input 100 percent to output 100 percent). 3. Widely Applicable: 1 in 4 out or 4 in 1 out two wiring methods, suitable for headphones amplifiers, laptops, amplifiers, active speakers, players, etc. 4. Separate Conduction: 4 way RCA stereo sound switch with full lossless signal input and output, switching control and signal input and output conduction separation. 5. Superior Performance: Switcher adopts sound signal without wire connection, RCA direct connection relay, high efficiency short way, lossless conduction. Gold plated RCA lotus socket, lower impedance. Specification: Item Type: 4 in 1 Out RCA Switcher Material: Aluminum Alloy Control Mode: Knob Switch 4 Block Switching Number of Switching Channels: 4 Way (4 Way Input Signal or 4 Way Output Signal) Number of Channels: Stereo 2.0 Signal L R US Plug Voltage: 100-240V. Package List: 1 x Sound Switcher1 x Adaptor1 x Power Cord1 x Instruction Manual