4-In 1-Out Rca 3.5Mm Auxaudio Switch Box Audio, Rca+Aux 4In-1Out/1In-4Out WisWinDa Specialized in Audio Devices, Making Your Audio System More Professional. RCA AUX audio switcher both working for 4-in 1-output and 1-in 4-out reversible, (Tips: 1-IN 4-OUT is not meaning 4 sets of output working simultaneously). WisWinDa RCA 3.5mm Aux speaker switch box is well designed with metallic shell with strong rubber mat make it very durable and convenient in using, quality RCA connector with gold coating make it no any signal loss in transmission. Passive audio selector design, plug play. No need extra power supply and no worrying about using the right power supply as this is a very basic passive unit, aluminum alloy switching button, easy to setup and requires no DC/AC adapter. This device is compatible with most of the audio sources signal select or multi-rooms paralleled amplifiers and active speakers. It?s very suitable for philharmonic as it no loss richness of the music. (Tips: Almost all of the audio switchers don?t have the noise isolation functions, if you need the audio isolator please select the right one based on the audio devices you had.) Device Dimension: 5.5*3.55*1.65inch Device NW: 0.66lb