Usage Tips:RCA L/R stereo audio switcher 4 IN 2 OUT or 2 IN 4 OUT. Suitable for multiple sources signal select or multi-room paralleled amplifier or active speaker distribution of the same signal playback. Use audio rotary switch/Lossless device, switch between different audio in or out. Stereo Switch Box with Signal Lossless, Sturdy Aluminum case Strong Anti-Interference, Compact Connector Distributor RCA L/R Stereo Splitter Boxes. Will not increase the sound or make the sound not fade. Simply allow you to switch between RCA cabler without in the way. The audio splitter box has 4 audio source inputs, 2 output (4 inputs and 2 output) or 2 input and 4 outputs (2 input and 4 outputs), supporting Bi-Directional Audio Switcher. The passive RCA switch has a sturdy construction, all metal, beautiful appearance and reasonable design. Simple operation, Plug and play, easy to use, no external power required. Connect the RCA output cables of your different home audio types of equipment to the RCA input on our equipment (on back). Turn the knob on front panel to switch different audio source . color:Black Material:plastic Package Contents: 1 x Bi-Directional Audio Switcher Only the above package content, other products are not included. Note: Light 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.