Made by Mandarin Electron Model Number: ME03 QT Matryoshka-shaped Theremin Height: Approximately 21cm Width: Approximately 9.5cm Uses 4 AA batteries (batteries not included). Volume switch works without issue. Pitch also changes. Output terminal untested. Includes instruction manual and box. Although hardly used, it has been stored at home for a long time. No scratches or cracks are visible, but please understand that this is a used item. Returns are not accepted for reasons other than operational defects such as failure to start or no sound at all.