Introducing the Promaster Cyber Aqualand NX; Citizen's new professional Nitrox Wrist Dive Computer Watch Features Fully Automatic Calendar Alarm Destination Timer 1/100th Second Chronograph (up to 23 hours 59 minutes 59 seconds 99) Countdown Timer from 99 Minutes to 1 Minute in 1 Minute increments World Time (up to 30 cities across 48 time zones) Backlighting All Stainless Steel case 200 Meter Water-Resistant Full CITIZEN warranty Nitrox-Specific Features: O2 % Setting (22-50%) by 1% increment Maximum PO2 Warning (1.6 Fixed) Oxygen Toxication Time OTT Calculation and Warning Alarms sound for all Nitrox warnings Dive Computer Features: Full Decompression Data using DCIEM Model Dive Log memory for up to 100 dives Depth display and memory - current and max - up to 266 feet Alarms for Ascent Rate; Depth Alarm; Maximum Depth and Nitrox warnings Water temperature display and memory - current and minimum Dive start; finish and elapsed-time memory (up to 199 minutes) Depth & Water Temperature Log Water temperature display (-10C to 40c) Calculation of No Fly Time and Residual Body Nitrogen Surface interval measurement Automatic altitude adjust ment Battery life indicator