Patented Air Time Remaining algorithm provides extremely accurate time based on current depth and your personal air consumption * Dual Algorithm | Custom alarms | SmartGlo® Backlighting | Fresh water and salt water calibrations | 3 gases - NX to 100% * Deep stop | Adjustable safety stop settings | Log saves detailed dive data for last 50 dives * Data Retention - maintains calculations indefinitely when the battery is changed | Review Card | Manual * User changeable Dual Algorithm - Pelagic DSAT (Spencer/Powell data basis) or Pelagic Z+ (Buhlmann ZHL-16C data basis) - Gives the diver the ability to select a conservative or liberal algorithm to fit their diving needs