>This is an amp switcher/speaker switcher. You can choose 2-IN-1-OUT for 2 amplifiers to 1 pair of speakers, or in reversible direction of 1-IN-2-OUT for 1 amplifier to 2 pairs of speakers(Note:this way is switch one pair loudspeaker A or loudspeaker B work,They don't work at the same time). So you could compare 2 amps or 2 pairs of speakers quickly and conveniently | >You can easily with just one press of for A/B switch. This is a passive non-powered device. Plug and play | >In/Out through the high quality golden plated banana jacks, which can accept up to 12 gauge wires | >The internal connection wire uses UL1015 14 AWG wire, which is enough to pass high current | >Power rating: 100W RMS, 200W Peak for each channel

***2022 Upgrade Version:>>1.Upgrade the immersion gold of the pcb circuit board, Increase the width constraint, and ensure the lossless transmission of the signal. >>2. Using high-quality CMC 816 gold-plated RCA interface, high-brightness brushed CNC solid aluminum knob, sturdy aluminum shell, 6mm thick front panel, beautiful and atmospheric, it is an audiophile level | This compact switcher box allows connection of up to 4 stereo sources input and selects 1 audio output through the rotary knob (Note: when 1-in 4-out: 4 outputs are not simultaneously) | Suitable for multiple sources signal select or large area or multi-room paralleled amplifier distribution of the same signal playback | Use specialized audio rotary switch/Lossless device, easily switch between different audio in or out | This is a passive non-powered device. Plug and play

This compact switcher box allows connection of up to four stereo sources, between two amplifiers | Use specialized audio rotary switch/Lossless device, easily switch between different audio in or out | Build in quality aluminum chassis and solid aluminum knob, looks nice and durable | In/Out through high quality golden plated jacks | This is a passive non-powered device. Plug and play

RCA switcher 3 input 1 output or 1 IN 3 OUT reversible,(NOTE:“1 IN 3 OUT” is not 3 sets of output at the same time ) | Suitable for multiple sources signal select or large area or multi-room paralleled amplifier or active speaker distribution of the same signal playback | High quality golden plated RCA terminal/ Solid knob and aluminum box | Use specialized audio rotary switch/Lossless device, easily switch between different audio in or out | Passive device,no need power supply