Product Features: Do you have one set of playback equipment and three sets of balanced signal equipment that need to be connected, but you don't know what to do? The powerful balanced signal stereo selection switcher can solve the problem of connecting and unplugging multiple devices without external power supply, and switch without loss. 1. One set of balanced signal input and three sets of balanced signal output 2. The switch uses a three-position rotary high-contact, high-precision, and high-reliability knob switch to lossless switching. Adopts a short-circuit-free switching mode. Adopts a cold and hot simultaneous switching mode. Note: All GND input and output interfaces are universal. The input and output terminals are configured symmetrically on the left and right, and the internal wiring is separated on the left and right, using a left and right separation structure. Reduce mutual interference between left and right signals. When switching operations and rotating the gear switch, there be no popping sound, which not affect the sound quality and lossless transmission. When used as a playback signal source device and power amplifier (preamplifier) selector (1) Connect the signal source device to the input COM. (2) Output terminals can connect up to 3 preamplifiers or preamplifier main amplifiers. Do not connect the L/R connections incorrectly. Color: Black Material: Metal Package Contents: 1 x Fully Balanced Signal Selector Only the above package content, other products are not included. Note: Light reflection 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.