Lock Function: One lock button which protects from clearing by accident, switch to LOCK side will enable protect function, that can not erase handwriting. Switch the lock button on the back to unlock side will enable the LCD writing tablet one key to clear. Low & Safe BatteryThe built-in battery is only used for the delete function, the graffiti does not consume power, which achieves low power consumption and long standby. Set screw on the battery button that no worry the children swallow unknown parts. Functional & Eco-friendly: Reusable drawing tablet is suited for writing, drawing, office memo board, message board and as a communication tool. No more scrap paper as the doodle board or practicing paper, protect the environment and save money. Lightweight & Portable: 10-inch drawing tablet is easy to put in a purse, school bag or briefcase, so you can use it whenever you want. Perfect for splash the imagination of you and your kids on this drawing board during car rides or airplane trips. ATTENTION:There might be some marks left on the LCD screen due to long-distance transport. It's normal, just press the delete button to erase.