Features: Two in oneThis desktop calculator is a combination of calculator and writing board. With the stylus magnetically attached to the side, you can use it for arithmetic and writing or painting at the same time. Easy to useWith an erase button, you can erase the full screen in one click. The drawing tablet can be folded to lock the screen to prevent accidental removal. Replaceable BatteryPowered by 2*CR1220 button battery, no need to charge and connect, energy consumption 'ultra-low energy, long service life. Healthy and environmentally friendly The writing board supports repeated writing, reduces paper consumption, and is made of a flexible liquid crystal panel for eye protection. Convenient to carry The calculator is small, ultra-thin, foldable and portable, convenient for learning, writing, painting and professional communication. Features: Black color Material: ABS Screen size: 6 inches Battery: 2 x CR1220 Button Cell, 40mAh, 3V Item Size: 16 x 15.6 x 0.5cm/6.3 x 6.1 x 0 .2 inch (unfolded). 16 * 7.8 * 1.2cm / 6.3 * 3.1 * 0.5 inch (folded) Weight s of item: 119 g / 4.2 (oz) Package size: 16.5 * 8.4 * 1.5 cm / 6.5 * 3.3 * 0.6 inches Package weight: 135g / 4.8 (oz) Note: No rinsing, no exposure to strong sunlight, no contact with fire, no crushing or scratching the surface with hard objects. Packing list: 1 * writing tablet 1 * Stylus