Tips for using the writing pad: 1. When the writing pad is left for a long time or not used for a long time, the delete button may not be deleted. Please remove the battery, rub it with your fingers, or clamp the positive and negative poles of the battery with a metal object for 3-5 seconds , You can reactivate the battery, do not reverse the front and back of the battery, reinstall it into the writing board and delete it normally; 2. The initial state of the handwriting pad lock button is off, please confirm whether the lock button is turned on for the first use; Why choosing this LCD write board. Multi-functional, the other side can be used as ruler and mouse pad. Ultra 1/8 thin inch,12 inch LCD writing table.Sealed 3v watch battery provides over 50,000 erase cycles. The case and LCD are made from durable plastic materials.Integrated magnets allow for easy mounting to compatible surfaces. Environmental-Friendly and Economically. An alternative to traditional paper, Erase your image with the Touch of Erase Button,saving you a lot of money. Good Company for Children in Daily Life and Study Good for Writing, Arithmetic, Spelling and Drawing practice. Good way to help establish children's awareness of environmental protection simultaneously. Love from family-- To-do lists recorder, messages reminder. Perfect for writing to-do lists, shopping lists, appointment reminders,short memos and leaving notes for friends and family. Say Good-bye to Mussy Working Areas. Annoyed by the paper flying around in your work office Want to keep your working area clutter-free and stay organized That's it Our LCD Writing Board will drive all the troubles away and keep you a good working mood. Best Gift for Family/Children Love from family-- To-do lists recorder, messages reminder. Perfect for writing to-do lists, shopping lists, appointment ,Games like Bingo,Hangman, Naughts and Crosses, etc. will add enjoyment of daily life and get-together time and this LCD board definitely become a good instrument. Material: ABS+ Electronic Parts; Input Pressure: 10~20 GInput Voltage: AC 36V; Frequency: 1Hz; Size: 28x18.5x0.5cm; Power supply: 1 x CR2020 button battery; Weight: About 180g; Package included: 1 x 12 Inch LCD Writing Tablet 1 x Pen 1 x CR2020 button battery