Kaleido 3 E-ink display with Bigme's automatic ghosting elimination algorithm for better reading, website browsing and video streaming experience. Smooth handwriting with smart pen without any delay. It supports remote control like page up/down by the pen.And there supports more than 100 templates and we can add our own template. And global handwriting also supported for oneNote and Kindle. We can make annotations on the Apps. Reading experience are very good on Eink display and soft front light. Comic Apps are also supported from Android open system. It supports translation and notes when reading. ChatGPT in App center can chat, make composition and AI summarize the meeting records. In meeting records app-- Offline Voice to Text transcription keeps your work at anywhere in anytime. And Polish the meeting records by ChatGPT. User guide in App center, a brief guide to show you how to use the device effectively or if you have any using problem, freely to contact our sales-service for help. CPU: Octa-core processor CPU Frequency: 2.3 GHz Internal Memory: 6 GB RAM Internal storage: 128 GB Operating system: Android 11 open system TF slot/SIM: Yes(SIM only for B34 B38 B39 B40 B41 in Southeast Asia) Screen: 7.8” Color E-ink display (Kaleido 3 Screen) Resolution: 300PPI B/W, 150PPI Color Documents Formats: PDF,TXT,EPUB,HTML,HTM,AZW3,RTF,FB2,DOC,MOBI,PPT,XLS Image Formats: PNG,JPG(JPEG),BMP Audio Formats: WAV,MP3 Expansion Interface: Type C port (support OTG) Battery: 3000 mAh Lithium Polymer Built-in Wifi, Bluetooth, Speaker, Fingerprint unlock function, built-in 2-mic