Specifications: Product Name: Smart Pen Set Smart Notebook Handwriting temporary storage capacity: 4MB Wireless connection: Bluetooth 5.0 BLE Support Operating system: all Handwriting resolution accuracy: 1/600inch Image frame rate: 80HZ Writing speed: 20cm/Sec Writing Angle: 360 degrees Indicator: blue and red dual color indicator Weight: 17.6g Charging power: 5.0V Charging time: about 2hours Usage time: about 8hours with tail plug length: 161mm/169mm (including cap) without tail plug length: 156mm/164mm (including cap) Diameter: 10mm, circumference: 31.4mm Features: Smart Pen Writing Set: This smart digital pen set contains everything you need to start digital writing - a smart pen, a paper screen synchronization book, a synchronization handwriting board, a USB charging cable and 3 oily pen refills. With everything in the package, you can start writing as soon as you receive it. Real-time transmission: The smart notepad uses advanced BT 5.0 chip and high-precision electromagnetic sensor technology, which can use the "MasterBen" APP to transmit what you write on the notebook to your mobile phone screen in real time. The APP is compatible with iOS and Android systems. Exquisite image quality, no missing words: Using unique invisible dot matrix recognition technology, the smart digital pen uses dual infrared cameras, high-sensitivity content recognition, 360° arbitrary angle writing, accurate capture of what is written, heard, and drawn, real-time digital storage and sharing of what is written. One-click storage and sharing: Just click the corresponding icon to save the current writing content and automatically open the next page. Easily access notes, inspirations, paintings and doodles from mobile devices, and share pictures or PDF formats to classmates, teammates and colleagues with one click. Rich in functions: App and notebooks can achieve more functions. Support recording, click the recording button on the notebook; there are 4 writing colors to switch; can write offline, and can connect Bluetooth to the APP after writing. The App can restore the writing track and display details. Lasting all day: The battery life can write continuously for up to 8 hours after full charge, and the standby time is about 120 days. Wide Application: Draw and record important information anytime, anywhere. Capture your thoughts and ideas, you can convert them into digital, shareable files, and when you are ready to turn the page, just press the multi-function button on the smart notepad. It is the best gift for students, office workers, designers, artists, etc. Packing included 1 * Smart Pen 1 * Paper Screen Synchronous Notebook