This is the Sonic Clean Fine RZ-101 ultrasonic cleaner from Imotani Corporation. It's an ultrasonic vibration cleaner that uses microscopic sound wave vibrations to clean dirt from small crevices in items like glasses, watches, accessories, shaver blades, and dentures. Batteries are not included. • Model Number: RZ-101 • Accessories: Watch holder, instruction manual I used it once and then stored it in a box in a dark place. The box has some dents and scratches, but the main unit has no noticeable stains, and I confirmed that it works without any problems. I would appreciate it if you could purchase it with the understanding that it is a used item.