Multi-Function: Smart Calculator & LCD writing tablet, 12-digit display, write while calculating, convenient and practical. Environmental Friendly: The writing pad supports repeated writing and is paper-free, no ink and no dust. LCD screen, no blue light, helps protect eyes. Erase & Lock Button: With an erase button, you can clear the full screen with a click. The lock key helps prevent accidental deletion. Replaceable Battery: Powered by 2 x CR1220 button batteries, no charging or cables required, ultra-low power consumption, long service life. Wide Application: Compact and portable, folds for easy storage, suitable for children and adults at home, office, school, and more. Screen Size: 6 Inch Item Size: 16 x 15.6 x 0.5cm / 6.3 x 6.1 x 0.2 inch (Unfolded) 16 x 7.8 x 1.2cm / 6.3 x 3.1 x 0.5 inch (Folded) Color: Black Material: ABS Package Contents: 1 x Writing Board 1 x Stylus Pen Only the above package content, other products are not included. Note: Lighting and different displays may cause slight color differences between the item in the picture and the actual item. Measurement allows an error of +/- 1-3cm.