Multi-Function: Smart Calculator & LCD writing , 12 digits display, write while calculating, convenient and practical.Environmental Friendly: The writing pad supports repeated writing and paper free, no ink and no dust. LCD screen, no blue light, protect eyes.Erase & Lock Button: With an erase button, you can clear the full screen with a click. The lock key can prevent accidental deletion.Replaceable Battery: Powered by 2 * CR1220 button battery, no need to charge and connect, ultra-low consumption, long service life.Wide Application: Small and portable, folding storage, very suitable for children or adults use in home, office, school, etc.Screen Size: 6 InchItem Size: 16 x 15.6 x 0.5cm/ 6.3 x 6.1 x 0.2inch(Unfold)16 x 7.8 x 1.2cm/ 6.3 x 3.1 x 0.5inch(Fold)colour: blackMaterial: ABSPackage Contents:1 x writing board1 x stylus penOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.