Thank you for viewing. Each jack and switch functions without issue. The unit has not been subjected to foot-switching or being moved around in an effects board, so the exterior is generally in good condition. This is a passive ABY box and can be used without power. The adapter is only for lighting the LED, and I actually used it without power. It has a phase switch, so it can be used without problems even with amplifiers with different phases. Also, it is true bypass and passive, so you can output from two outputs with almost no change in sound quality without going through a buffer. (Sound thinning occurs with high impedance input, so a buffer is needed in the preceding stage.) It also has a tuner out, so strictly speaking, it has a 1 in 3 out structure. The foot switch functions are A or B, or simultaneous AB output selection, so it can be used as an AB box and a splitter. Power is only from the adapter, and batteries cannot be used. Specifications ■ Guitar effects pedal ■ Passive AB selector, splitter ■ Equipped with tuner out ■ True bypass specification ■ This is a convenient switcher that can switch between two guitar amplifiers or play them simultaneously. It is a passive type, so no power is required.