This is the Genesis Centauri Watch Scuba Diving Computer, Freediving Computer Features: Diver log Smart phone wireless sync Long battery life Audible alarm Vibration alarm Hibernation mode Temperature Scuba, Free dive, and watch mode Rechargeable battery (charge time 3-5 hours) Backlight screen Nitrox support up to 56% Maximum operating depth: 100m/328 ft. SPECIFICATIONS Lightweight wrist-mount dive computer Daily time piece capabilities Simple function navigation Bu?hlmann ZH-L-16C Algorithm Screen diameter: 1.1 inches The Genesis Centauri Dive wrist mount computer is fully capable of all your diving needs. Whether you are scuba diving, free diving or Nitrox trained, the Bu?hlmann ZH-L-16C algorithm will help guide you to manage all of your diving needs. Every setting is available to customize, in order to have this dive computer work the best for you. Plus, it is stylish enough to wear every day.