5.0 inch TFT Electronic Papar with super slim design Resolution: 800(H) * 480(V) display size:110*66MM product dimension: 161*103*11MM Weight approximately: 172g Processor: DOXCHIP OS: Ulive I/O :3.5mm stereo audio jack for earphones Internal memory 4GB Format :TXT/b2/html/pdb/dpf/epub Extend Memory SD Card:up to 4GB support SDHC Power Supply Built in Li Polymer:1800 mAH Download USB 2.0 IMGAE: JPEG/BMP Audio: MP3 WMA WAV RM OGG AAC M4A FLAC APE Video:1018P:RM RMVB AVI MPG MPEG DAT FLV WMV FM TRANSMITTER OPTIONAL Language:English and more Operating temperature :0 to 40 degree Celsius Storage temperature:-20 to 55 degree Celsius Special Features: 1. Extremely low power consumption. each full charge can sustain 30days reading 2. Passive lighting and diffuse surface relaxes your eyes and reduces eye strain. 3. The standard interface of SD card enables you to add books unlimitedly. 4. Cute, Light and thin. Easy to take 5. Lessen travel pressure and add more amusement.