This Is A Rechargeable, Multi-Function, Silent Pocket Desktop Calculator For ?Calculator with Notepad?:Have you ever been trouble that you had to remember the result of a number during a calculation,but couldn't find paper and pen to record it? This finance calculator is comebining with lcd writing board which can solve this problem perfectly.It is designed by a Japanese designer which pursuing minimalism and paperless eco-friendly.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,sensitive and mute,not interfere with other people,"locked"key function to save your important notes prevent deleting.The basic calculator is an ideal choice of leaving messages to kids and yourself,and perform 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 oz 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.We also provide protective bag which is High quality and waterproof for this conversion calculator. ?Healthy and Eco-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 times and calculator paper free,no ink and no dust.Reducing paper consumption and being environmentally friendly. ?Great Battery Life and 3-Year Free Refund or Replacement?: Compared with traditional adding machine calculator,our calculator for desk applies Type-C cable to power itself.Charge it 90 min single times,Battery Life last for 3 months,Great choice for eco-friendly lifestyle.Your satisfaction is our goal,we pay great attention to customers'benefit.We provides 3-years free refund or replacement,so any problems,please contact us.we will reply in 12 hours.