Multi-Function: Smart Calculator & LCD writing tablet, 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 power 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 Inch Item 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: black Material: ABS Package Contents: 1 x writing board 1 x stylus pen