Learniture LNT-GNO1008-PK-SO 30-Bay Tablet Unassembled Charging Cart with Electric, Black Built-in electrical assembly lets you charge up to 30 tablets at a time. Durable steel frame features ventilated panels to keep your laptops from overheating. Locking front and rear doors provide secure storage. Height-adjustable shelves let you create the most efficient arrangement for your devices. Tablet shelf dimensions: 11.75" D x 10.5" H (each tablet slot is 1" W) Side handle and four non-marring, rubber casters (two locking), make it easy to move the cart between rooms.