Calculator is a combination of basic calculator, erasable 6 inch LCD writing tablet and inserted stylus which you can use to write during the calculation. Clear 12-digit display value improves efficiency and makes calculation easier. LCD screen without blue light and backlight, writing is more comfortable and eye protection. Environmentally friendly with solar battery dual power and an extra battery offered - With the double power supply, solar and batteries, the calculator is even more energy-efficient. The office calculator has a delete button, so it can be effectively reused to reduce paper consumption and be environmentally friendly.Inserted pen and lock screen function - Different from the traditional magnetic pen on the side, looks this improved design for inserting the pen into the calculator is better looking and more convenient. so that the pen is not easy to lose and you can calculate and record at any time. Design with lock screen function to avoid accidental prevent erasing of information on the writing pad. Slient Operation - The calculator's keyboard is made of silicone, bringing you a more comfortable touch and quiet experience. When you calculate the data, you don't have to worry about others in the office, at school and at home disturb. PORTABLE - This lightweight desktop calculator is flip type, with this feature you can protect the keyboard well. This handwriting calculator is only 135g, 14.9*8.9*1.3cm, handy and easy to carry. You can put it in your pocket, pocket or even Take your handbag with you and can be used at any time.