【Product Description】 This is a genuine SONY MD Walkman external dry cell battery case. ・Operation has been confirmed with the MD Walkman "MZ-E501" ・There is a break in the negative terminal spring. ・Even in the above condition, power was supplied and use was possible. 【Condition】 ・Used / Due to age, there are scratches, scuffs, and deterioration. ・This is an item for sale as is. ・Considering the condition, it will be treated as "junk" for now. ・Please check the condition in the images. 【Notes】 As this is an old item, please purchase only if you understand that it may require repair, adjustment, or parts replacement.