Features: 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. Long Endurance: Built-in 120mAh lithium battery, ultra-low power consumption, long service life. Type-C rechargeable design, quick charging and easy to use. Wide Application: Small and portable, folding storage, very suitable for children or adults use in home, office, school, etc.