Sofia+Sam Deluxe Memory Foam Lap Desk with USB Light (Silver) Workstation that goes where you go Cool and comfortable design with built in wrist rest and handle for portability Supports Laptops 18 inches or smaller The Deluxe Memory Foam Lap Desk requires (4) AA batteries (not included). Includes detachable USB light that can plug into the Lap Desk or into your computer's USB port