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.  Features: - Writing pad adopts display technology, pressure-sensitive LCD. - Best Alternative to Paper, Pens, chalks, whiteboard and blackboard. - Perfect for Memos, Practicing Handwriting / Arithmetic, Drawing & Pictures. - For All Ages. Easy to Use. Stylus Included. - Erase the image with the touch of a button. - The screen is covered by scratch-resistant & anti-dazzling film. - The case is made from durable ABS plastic materials. - Product Name: 8.5 Inch Writing Tablet - Product Size: 223-151.3-5.3 mm - Product Color: Black,Light Blue, Blue, Light Pink, Red - Battery: CR2025 button cell - Weight: 157.2 g - Life-cycle: over 100,000 times re-write - Working Temperature: 0℃~40℃ - Storage Temperature: -10℃~60℃