Item Type: Handwriting Board Material: LCD, ABS Product Battery Type: Button Battery (Shipped with Built In Battery) Battery Model: CR2016 Battery Capacity: 75mAh Number of Batteries: 1Pcs Package List 1 x Handwriting Board 1 x Pen 1[LCD Screen Design]The LCD screen has no radiation, protects eyes, and is safer and more comfortable to work for a long time 2[Easy Carry]Innovative full screen design, easy to carry, easy to put into briefcase, backpack or other bags 3[High Efficiency] Simple operation, high efficiency, just press the clear key to clear all the contents 4[Long Time Application] Built in replaceable button battery, with a life of more than 1 year, without worrying about power failure 5[Reinforced Durable] Reinforced anti falling, friction resistant writing, writing feeling closer to real paper