The Sofia + Sam Memory Foam Lap Desk with Light is the ultimate portable workspace. Comfortably use your laptop computer, e-reader or tablet from a chair, sofa, or even in bed. The lap desk has a luxurious layer of memory foam for total comfort and support. With the detachable USB light, you can even read or surf the web in the dark. The Deluxe Memory Foam Lap Desk requires (4) AA batteries (not included). Surface area above the wrist rest: 19" x 12".