This is a BOSS VT-1 voice transformer. It's a voice changer, so you connect a microphone and use the four knobs to change your voice and output it to an amplifier or external device. I think it's a device that can be used in live performances, recordings, video production for voice changing, streaming, and events. It's in relatively good condition. Operation has been confirmed. This is an auction for the main unit and the genuine adapter only. One owner (I bought it new and kept it in storage), so you can be assured of its quality. Since it is a used item, there may be some dirt, scratches, and scuffs that are difficult to see in the photos. Please consider this only if you understand that. *Please refrain from purchasing if you are concerned about minor details. - Model: VT-1 - Brand: BOSS - Power: 9V 300mA AC adapter - Input/Output Terminals: LINE OUT, MIC OUT, INPUT, REMOTE Recommended for those looking for a VT-1 in good condition, those who collect old digital instruments, and those who want to use a voice changer for events, streaming, or video production. Recently, old digital instruments seem to be popular with collectors overseas. If you are interested, please consider purchasing it as soon as possible. Thank you for viewing.