Oceanic Veo 2.0 Combo Swivel 2 Gauge Computer Powered by Oceanic's Exclusive Dual Algorithm&trade; - 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