Powered by Oceanics Exclusive Dual Algorithmﾃ｢ﾂﾂ｢ - lets you choose the decompression algorithm basis that best suits your diving needs without compromising safety.;3 Operating Modes: NORM (Air and Nitrox), GAUGE (with run timer) and FREE (tracks calculations to allow switching between NORM and Free);2 Operating Buttons allow Step Forward and Fast Scroll Interface for streamlined access and setting of personal options;Air or single Nitrox mix to 50% O2;Audible Alarm with flashing LED light and User Acknowledgement