The Boogie Board is a thin (3.4 mm) tablet with a durable, plastic LCD writing surface. You can make thick or thin lines with the stylus (or a fingernail) to sketch, doodle, take notes, and more. But possibly the best part is that when you're done, you just hit the "erase" button at the top of the board. The Jot 8.5 board has a writing surface of approximately 5" x 7". It includes an eWriter stylus, a 3V battery that will last the life of the product, and also comes with magnetic strips you can attach to the back of the board if you'd like to affix it to a refrigerator, file cabinet, etc. The Jot Kids board also includes a hard-shell case for extra protection. The Blackboard Letter board is 8.5" x 11", with a clear writing surface for writing on one of the four interchangeable templates or when writing over paper. This version also includes a lock setting and an eraser on the stylus for erasing like a pencil.