It has been confirmed to be in working order and can be used without any problems. This theremin is more suited for producing sound effects like John Spencer rather than playing melodies. Standard Ishibashi theremins tend to wobble if not secured, making them difficult to use in live performances. Therefore, to make it easier for guitarists, bassists, and drummers to use in live settings, it has been modified at a specialist shop with an adapter to attach to a microphone stand and a two-stage angle-adjustable antenna to increase the freedom of the antenna angle during live performances. It provides a visual impact on stage and can produce outstanding sounds even within techno or garage bands, and adding delay can create an even more spacey atmosphere. Setting it up as a formal theremin would limit the range of hand movement, so it's intentionally set to allow for a wider range, and controlling it with a volume pedal makes live performances easier. The left knob in the first photo is for power on and volume. The right knob is for sensitivity (frequency adjustment), and the pitch effect reverses at the silent point at 2 o'clock on the knob as shown in the photo. Specifically, from 8 o'clock to 2 o'clock on the knob is the normal mode, where the pitch increases as you get closer, and from 2 o'clock to 4 o'clock on the knob is the reverse mode, where the pitch decreases as you get closer. In both modes, touching the antenna produces irregular "kyu-pi-kyu-pi" sounds. For how to use the theremin as a sound effect type rather than for playing scales, please refer to live videos of John Spencer and others. There is some wear and tear commensurate with age, but there are no major scratches. Please enlarge the photos to check the condition of the product. The 9V battery used for the operation check is included. Please understand that this is a used item and no claims or returns will be accepted.