DescriptionThe item is a professional and practical battery adapter converter cases, which are specially used to convert any size AA to size D battery for use. Just put 2 AA batteries into the converter, it will function the same as a D-size battery. Therefore, it is perfect for electronics and emergency situations.Features- Color: transparent. - Material: durable hard plastic. - and Battery Adapter Converter Case - Can convert any size AA battery to a size D battery. - Option to use 1 AA or use 2 AA for more capacity. - Perfect for electronics and emergency situations. - A gadget to keep close at hand, at home, at the office, etc.