[Calculator with Notepad]:This finance calculator is comebining with lcd writing board which can solve this problem perfectly.You can take notes while calculating,calling and meeting,which improving your study and work efficiency. [Mute Design and Memo Locked Function]:The small calculator keys adopt high quality silicone which feel comfortable,waterproof, and mute,not interfere with other people,"locked"key function to save your important notes prevent deleting.The basic calculator is a perfect choice of leaving messages to kids and yourself,and 4-function mortgage calculator and tax conversions efficiently for finance,office,accountants,school and home. [Lightweight and Portable & Extre Protecive bag]:This mini calculator weighs 4 and have a flip cover that can be protecting the keyboard.You can put it in your pocket and bag.It is portable that you can carry it to anywhere and can be removed and used immediately when needed. [Healthy and -friendly] : The LCD screen of is designed by no blue light that protects your eyes,The writing pad with One key clear function supports reusable writing 50,000 and calculator paper free,no ink and no dust.Reducing paper consumption and being environmentally friendly. [Great Battery Life ]: Compared with adding machine calculator, calculator for desk applies Type-C cable to power itself instead of one-time button battery. color:Black Material:ABS size:150 x 90mm Package Contents: 1 x Calculators 1 x USB charging cable 1 x English manual 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 a little different from the real thing. The measurement allowed error is +/- 1-3cm.