Rca L/r Stereo Audio Switcher 4 In 1 Out Or 1 In 4 Out. Main Functions: (1) Select Audio Input Between 1/2/3/and 4 With Knob Siwtcher And Get One Output; (2) Select Audio Output Between 1/2/3/and 4 To Receive One Input Suitable For Multiple Sources Signal Select Or Multi-room Paralleled Amplifier Or Active Speaker Distribution Of The Same Signal Playback. Use Specialized Audio Rotary Switch/lossless Device, Easily 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. Plug And Play, No Power Needed, Wont Affect Sound Quality. Colour:black Material:metal Size:10.7 X 9.2 X 4.1cm Package Contents: 1 X Bi-directional Audio Switcher Only The Above Package Content, Other Products Are Not Included. Note: Light Shooting 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.