WonderSwan made by BANDAI, a model that uses AA batteries. - Model: WonderSwan - Manufacturer: BANDAI - Model Number: SW-001 - Battery Type: AA batteries This item has been stored at home for a long time! Since there is no software, the operation has not been confirmed, but the screen does not change when the switch is turned on, so it is being sold as a junk item! Please consider purchasing only if you understand the above contents!