Retro Sega Toys, unused. (^^) Box size: Approximately 5.5cm cube Operation has not been confirmed. Opened for listing and to remove the battery. (CR2032 battery is not included.) The box shows significant aging, but the main unit and instruction manual are in quite good condition. The battery compartment opens with a small screwdriver. Since it's unused, the plastic insert is still in place (see images ③⑥). Thank you for viewing. Please understand that this item has been stored at home for many years.