Paquete de batería externa accesorio de estuche para casete reproductor de minidisco Sony Walkman
This is a battery case made by a hobbyist, made from a common hard plastic battery case and modified. For SONY MD E30 E50 E77 E505 E700 E710 720 E730. For SONY MD R90 R91 N1 N710 R900 R909 R910 N810.