Description The item is a set of 8pcs 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 - 8 pieces of the battery adapters in one set will be sold together.- 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. - Note: The batteries in the pictures are not included. Packing list: 8 * Portable Size AA to Size D Battery Adapters Converter Cases (Transparent)