Screen Type: E-INK Supportted file types: Txt, Html, FB2, CHM, RTF, MOBI, EPUB, DOC, PDF Operating System: ANDROID 8.1 Network Communiction: wifi Dimension: 153 * 108.5 * 7.5mm Touch Screen: Yes Display Screen: 6 inch PPI: 212 Microphone: Noise-Cancelling MIC (dual MIC)