Solar Energy Scientific calculators with Notepad:calculators and notepad are designed in one, you can take notes while calculating, improving study and work efficiency. The engineering calculator supports up to 10 digital calculations, the numbers are clear and readable, suitable for advanced and beginners. Repeatable writing: No blue light LCD screen protects your eyes. Equipped with an ergonomic magnetic stylus on the back, allowing you to write or draw bright and clear lines. After use, press the erase button once to effectively reuse, reduce paper consumption, and achieve the goal of environmental protection. Silent design:scientific calculators uses high-quality silicone keys, which are quiet and soft, without touch sound, and not interfere with others when used. Built-in 2 button batteries, 1PCS LR1120 calculator battery, 1PCS CR1220 LCD writing board battery, no need to recharge, it can be used for about one year. (If the battery is dead, you can replace the battery by yourself) Easy and portable:pocket calculator has a foldable design and weighs only 0.26 pounds, making it easy to put in a bag, pocket or purse. It is very suitable for work business, engineering calculation, accounting calculation, student physics calculation, home use, etc. Solar Energy Scientific calculator is a combination of desktop calculator and writing board, it can effectively save your pen and paper, calculate and record what you want. One click instant wipe:The calculators for students has a one-click erasing function, you can write and doodle repeatedly. Large LCD screen:The large LCD screen can display up to 10 digits, and the data is clear and easy to read, which is an ideal choice for study and work. Magnetic stylus:The stylus is magnetic and can be attached to the storage slot to prevent loss. Pen pressure sensing detection function:The stylus has a pen pressure sensing function, you can draw thick or thin lines at according to the pen pressure. Mute Silica gel button:Using silicone buttons, feel comfortable, without any noise, not interfere with other people. 2 button batteries:No need to install screws, can be replaced at any time, no longer have to worry about the battery is dead (the battery can be used for about a year). Easy to carry:The desktop calculator weighs only 0.28 pounds, which is about the weight of two eggs, and has a foldable design, which is light and portable. It is suitable for use in home computing, schools and offices. Colour:black Material:plastic Package Contents: 1 x Solar Scientific Calculator 1 x Pen Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.