Otamamin with volume adjustment and LED light. The sound changes with the intensity of the light. Comes with an Otamatone Pakupaku Holder (sold separately). Gakken Theremin Mini is included as a bonus. Sound is produced when batteries are inserted into the back cover. Tuning screwdriver and the main unit only. Both work without any problems. Will be withdrawn if there are no bids for a while. - Brand: Meiwa Denki - Model Name: Otamamin - Power Source: DC9V batteries are not included. - Features: Volume adjustment - Brand: Meiwa Denki - Model Name: Otamamin - Features: With LED light Thank you for viewing. Musical instrument... Otamatone, Gakken Mini Theremin