Specific: Item Type: Calculator Combined Size: Approx. 160 x 78 x 13mm/6.3 x 3.1 x 0.5inch Expand Size: Approx. 160 x 158 x 7mm/6.3 x 6.2 x 0.3in Battery: CR1220 120mAh button cell battery (battery included) Working temperature: -10-40℃ Material: ABS Function: tablet + calculator Weight: approx. 144g/5.1oz Black color Package list: 1 x Calculator (Battery Included) 1 pen 1 manual Features [With Writing Tablet] The combination of a desktop calculator with standard functions and a writing tablet can effectively save pen and paper, and you can calculate and record what you want. [Foldable Design] This solar calculator adopts foldable design, which is light in weight and easy to carry, can be put into your purse, pocket or even handbag, [Eco-friendly material] Made of high-quality environmentally friendly ABS materials, which are durable, wear-resistant and can be used for a long time. [Stable performance] With exquisite workmanship, non-toxic and harmless, safe, stable in performance and easy to use, so you can use it with confidence. [Wide Application] This graphics tablet calculator is widely used in many situations, such as office, business, home, school, study room, etc.