New Nitrox function: three – different gas mixtures during single dive; Wide, high contrast display with a 170 degree viewing angle, data displayed in large size characters; 4 buttons Simple to use Easy access, upgradeable software, hypoallergenic rubber strap, algorithm: Mares – WinCE RGBM; Deep Stops and safety stop functions, back lighting, user replaceable batteries, mineral glass lens, adjustable, altitude log book function; Air, Nitrox and BT function modes, precautionary Programmable, 492 depth rating, power indicators, audible alarms, calendar and temperature displays