The Theremin, an instrument that produces sound using high-frequency oscillations, was invented by the brilliant physicist Dr. Theremin. In the early 20th century, it heralded the coming age of electrification and caused a sensation in the West as a futuristic instrument. You can play music without touching the instrument, moving your hands around the antennas to enjoy the sound. The antennas have some bends. Operation has been confirmed. ・Size: W80 x D80 x H120mm ・Built-in speaker ・Uses 4 AA batteries; batteries not included. ・Otona no Kagaku (Adult Science) Vol. 17 (How to Play) ・The original tuning rod is missing, so a bamboo one has been made. Please understand that this is a used item before purchasing. Cancellations and returns are not accepted after purchase. It will be shipped in recycled packaging materials; please be aware of this. Thank you for looking.