Features: Two in OneThis desktop calculator is a combination of calculator and handwriting board. With the stylus pen magnetically attached to its side, you can use it for arithmetic and writing or painting simultaneously. Easy to UseWith an erase button, you can clear the full screen with a click. The drawing tablet can be folded to lock screen to prevent accidental deletion. Replaceable BatteryPowered by 2 * CR1220 button battery, no need to charge and connect, ultra-low power consumption, long service life. Healthy and Eco-friendlyThe writing board supports repeated writing,reducing paper consumption and is made of flexible liquid crystal panel for eye protection. Convenient to CarryThe calculator is small,ultra-thin,foldable and portable,convenient for learning,writing,painting and business communication. Specifications: Color: Black/White(optional) Material: ABS Screen Size: 6 Inch Battery: 2 * CR1220 Button Cell, 40mAh, 3V Item Size: 16 * 15.6 * 0.5cm/ 6.3 * 6.1 * 0.2in(Unfold) 16 * 7.8 * 1.2cm/ 6.3 * 3.1 * 0.5in(Fold) Item Weight: 119g / 4.2(oz) Package Size: 16.5 * 8.4 * 1.5cm / 6.5 * 3.3 * 0.6in Package Weight: 135g / 4.8(oz) Note: No rinsing;no exposure to strong sunlight;no touching fire;no smashing or scratching the surface with hard objects. Packing List: 1 * Writing Tablet 1 * Stylus