Powered by Oceanic"s Exclusive Dual AlgorithmTM - Your choice between Pelagic DSAT (Spencer/Powell data basis) or Pelagic Z+ (Buhlmann ZHL-16C data basis) * 4 Operating Modes: WATCH (Alternate Time, Chrono, Daily Alarm, Countdown Timer), NORM (Air and Nitrox), GAUGE (with run timer) and FREE (tracks calculations to allow switching between NORM and Free) * User-Friendly Interface with "Step Back" - allows forward and backward navigation through menus and settings - Switch between up to 2 Nitrox mixes to 100% O2 with no restriction (Gas 1 may be up to 100%, and may be less or greater than Gas 2) * Stop times 3 minutes - displays minutes & seconds - Deep Stop with Countdown Timer - Maybe turned on or off. 2 minute countdown at half your max depth, for dives greater than 80 ft / 25m * Single button access to "Last Dive" display (max depth & bottom time) - Data Retention - maintains calculations indefinitely when the battery is changed - Audible Alarm with flashing LED light - History Mode includes total number of dives, max depth, total dive hours, and lowest temp