Thank you for viewing. This is an external battery case for SONY MD Walkman. [Operation Check] Operation has been confirmed with the actual device. [Condition of the item] Please check the condition in the photos. [Included items] Only the main unit. [Compatible models] MZ-E720 MZ-E730 MZ-E510 MZ-E520 This is just a reference, please research again by the buyer. If you are looking for one, please consider this opportunity.