Features: Color: white, black, blue, red, green Material: ABS frame Product size: 22*14*0.5cm(8.5 ") Display: 8.5 inch LCD screen Input pressure: 100-200g Reflectance: 25%-30% Power mode: a built-in CR2025 button battery(Include) Cleaning: please wipe gently with a soft cloth Functions: writing, drawing, one - click delete Suitable for many occasions, light weight, easy to carry, reusable. The product supports one button lock screen, one button clear screen function and low power consumption. The use of the product is very convenient, no need for ink, energy saving and environmental protection. Products without radiation, harmless to the body, can be used safely. Note: Dear friend, if you can't clear screen,Please open the switch on the back.thanks.