Pull-out writing board:Flexible LCD writing board, no blue light, no radiation, escort for your eyes. Equipped with a stylus for writing and can also use fingers (hard objects other than stylus and fingers cannot be used for writing).Solar and battery dual power supply: Each product has a CR2032 coin cell battery and solar panel, dual power battery life, can meet daily needs.Handwriting pad lock function: the back of the calculator has a locking function, in the unlocked state, the LCD writing screen of the handwriting pad can be in a state of clearing comments, and in a locked state, after writing, pressing the clear key cannot clear the written content.Small size: The size of the whole product is 4.8*3.6*0.59inch,3.8 ounces, which is very small and can be carried around without taking up space.Health and environmental protection: comes with a handwriting board, no scratch paper, no dust and no ink. It can be repeatedly written more than 50,000 times, reducing paper consumption.Main material: ABS shell materialProduct color: black/white/grayBattery type: CR2032/3VAppearance size: 122*92*15mmProduct net weight: 108g