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 switch/lossless device to switch between different audio in or out. Stereo switch box with signal lossless transmission, sturdy aluminum case for strong anti-interference, connector distributor RCA L/R stereo splitter boxes. Will not increase the sound or cause audio fading. Allows you to switch between RCA cables easily. The audio splitter box supports 4 audio source inputs and 2 outputs (4 in 2 out) or 2 inputs and 4 outputs (2 in 4 out), supporting bi-directional audio switching. The passive RCA switch features sturdy construction, all-metal housing, sleek appearance, and efficient design. Simple operation, plug and play, easy to use, no external power required. Connect the RCA output cables of your different home audio equipment to the RCA inputs on the device (on back). Turn the knob on the front panel to switch between different audio sources. Color: Black Material: Plastic Package Contents: 1 x Bi-Directional Audio Switcher Only the above package content is included; other products are not included. Note: Light and different displays may cause the color of the item to appear slightly different from the real thing. Measurement may vary by +/- 1-3 cm.