Multi-function Portable 2.4 inch Display Screen Scientific Calculator, Support Sound Recording / Radio / Music & Video 1. Material: ABSMetal 2. Battery capacity: 900 mAH 3. Charging mode: USB 4. Return one key to the calculator interface (e-book or video interface can return to the calculator state with one key) 5. Backlight brightness: 1-5 adjustable 6. Built-in memory, you can also insert another memory card. 7. Music Playing: Support WMA, WAV and other formats. 8. Image browsing support: JPEG, BMP, GIF format browsing 9. Video playback support: AMV, AVI format video playback 10. Functions: recording, radio, text document reader, calculator, time and calendar display 11. Weight: 125 g 12. Size: 15.5x7.5x0.9cm