Thank you for viewing. This is a SONY MD player MZ-E900 (body thickness approximately 13mm). There are small scratches on the body's battery insertion area and some scratches on the remote control. A new, third-party gum-type battery, purchased for operational testing, is included. It will run on the gum-type battery alone, but for stable operation, please use it with an AA battery. The box and instruction manual have discolored due to age. In preparation for listing, the main unit and remote control have been confirmed to be in normal working order. If you are looking for one, please consider it. Thank you. m(._.)m