Features:Clear the screen with one button and write repeatedly.brand new and high qualityElastic fit button, comfortable for touch of silicone button, beautiful design and the silica gel buttons are wear-resistant and with long service life.Mute button design, quiet study without interference, for students attending classes, large screen.for Tough solid thickened ABS and silicone material,durable and easy to use.With 4.0 inch pull-out handwriting tablet LCD screen is dust-proof and ink-free. Safety and hygiene.Use natural light to present handwriting,write without hurting eyes. Specifications:Material:ABSColor:Black, for Grey, WhiteSize: approx. 12.2x9.2x1.5cm/4.8x3.62x0.59in Note:Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes:1 x Calculator with Writing Board