Learniture 12-Outlet Laptop/Tablet Unassembled Charging Cart, NOR-GNO1005-PK-SO Black Built-in electrical assembly lets you charge up to 12 devices (laptops, netbooks or 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.Shelf dimensions: 16" D x 11" H (each device slot is 2" W) Side handle and four non-marring, rubber casters (two locking), make it easy to move the cart between rooms.