Electronic Erasable ruff pad writing tablet how to use :- use the provided stylus or any other kind of small, plastic material, to write or draw on the board. after you are finished, the board can then be easily erased with a click of a button. Battery Details:- CR2016 Button cell battery If the erase button doesn’t work, means the battery was run out. Please replace a CR2016 coin-cell battery and erase again. 1. Ultrathin & Light :- Slim and portable design, easy to carry and use. Use in office, at home and multiple sites, have one in hand for on the go, almost anywhere you would keep memo pads or scrap paper. 2. Eco-friendly :- Paperless & inkless writing revolution an alternative to traditional paper, to keep chaos off around the office or at home just erasing your sketch with one touch of a button. one replaceable cell, saying good bye to paper and ink whilst it is environment-friendly & non-toxic. 3. Multi-Purpose :- i) Kid Learning Toy -- writing or scribble, drawing as imagination.