At 80 percent brightness, Liao says the device's 4200mAh rechargeable battery gives it 4 to 5 hours of spreadsheet slinging bliss, and those buttons on the right side might be used to control more than brightness and contrast -- should the company adopt wireless USB as originally planned, Liao intends to have them double as arrow controls, allowing you to cut the cables and still have basic e-reader functionality.
ENGADGET: MEDL Technology's 'The Panel' hands-on Hands-on