Features: Extremely low power consumption, each full charge can sustain 15 days reading Passive lighting and diffuse surface relaxes your eyes and reduces eye strain The standard interface of SD card enables you to add books unlimited Cute, light and thin Easy to take Lessen travel pressure and add more amusement Specifications: Display: 6-inch e-ink electronic paper Resolution: 800 x 600 pixels Gray scale: 8-level gray scale CPU: Samsung S3C2440 400MHz Operating system: Linux Text formats: TXT, PDF, and FB2 Image formats: JPG, and BMP Extend memory: SD card 4GB (up to 8GB) Power supply: lithium-ion battery 1,000mA Download: USB 2.0 HS Audio format: MP3 Languages: English, Russian and simplified Chinese Dimension: 184 x 120.5 x 9.9mm Weight: 160g (approximately) Operating temperature: 0 to 40?C Storage temperature: -20 to 55?C