PRACTICAL: calculator is a combination of standard function desktop calculator and writing tablet, it can effectively save your pen and paper, you can calculate and record the things you want.PORTABLE: Clamshell design makes it easy to carry, you can take it in your bag, pocket or even purse, perfect choice for office business and home use.RECHARGEABLE: It comes with usb c charging cable, you also can use your usb c charging cable to charge the calculator, great choice for eco-friendly lifestyle.CONVENIENT: The Silicon-made keyboard makes it comfortable to Contact; Magnetic stylus makes it easy to use.Calculator with 6.5 Inch LCD Writing Tablet for Daily and Basic OfficeProduct Features:Fashion style - LCD display, ABS material durable plastic and silicone-made keys.Rechargeable - No need to replace battery Magnetic stylus - Can be attached to the calculator. Not easy to lose and easy to carry.One-Contact Instant Clear - Clear button allows you to use this notepad repeatedly after every full-screen writing.Lock Button - To avoid accidental One-Contact Instant Clear, you can choose the lock button in advanceFunction Instruction:Calculator Size: 90mm x 151mm x 15mmWorking Temperature:-14-140Charging Way: USB C chargingBattery Capacity: 120mAhFully charge Time: 90 minStandby Time: 6 monthsColour: BlackMaterial: ABSPackage Contents:1 x calculator1 x USB C cable1 x stylus penOnly the above package content, other products are not included.Note: Light 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.