ODYS Boox. Diagonal: 177.8 mm (7 "), Technology: TFT, Display resolution: 800 x 480 pixels. Document formats supported: PDF, TXT, Audio formats supported: AAC, MP3, OGG, WAV, WMA, Image formats supported: BMP, GIF, JPG, PNG. Internal storage capacity: 4 GB, Compatible memory cards: microSD, Maximum memory card size: 32 GB. Interface type: USB 2.0, USB connector type: micro USB A. Battery life (max): 20 h, Continuous reading time: 7 h, Continuous audio playback time: 20 h