Compared with traditional battery calculators, our calculator is with a Type-C data cable, no need to replace batteries frequently. It can be used for about 240 to 300 (depending on each person 39;s usage) with a 150-minute charge. It also has a solar panel, so you 39;t have to worry about running out of power when using it . It can also support continuous use for a period of time when the battery runs outHave you ever encountered the trouble of not being to find a pen and paper to record the results of the calculation process This financial calculator combined with an LCD writing tablet solves that problemThe compact calculator keys are made of high- ABS, which feels comfortable in the hand, and the sound is quiet when pressed, which is not easy to disturb others. The lock key function can save your important notes and prevent accidental deletion.and effective for financial, family, accountant assistance to perform 4 function mortgage loan calculation and tax conversion;Made of durable ABS material. A small portable general- desktop calculator , school, office or shop, do general and note-taking like we do, with multiple financial functions, perfect for adults and students. Gift box design, good giftMaterial: ABScolour: BlackPackage Contents: 1 x calculadora cientificaOnly the above package content, other products are not included.