Perfect for beginning divers, the affordable and compact Aqua Lung i100 Dive Computer contains a series of operating modes all navigated by one intuitive button. It has four modes - Air, Nitrox, Gauge, and Free Divel. Safety features include audible alarms, and a high-visibility LED warning light. This wristwatch-style computer provides you with all the essentials a new diver needs to stay safe underwater. 4 Operating modes - Air, Nitrox, Gauge, and Free Dive - for a variety of diving activities Supports two nitrox gases and nitrox mix to 100% O2 Features a pre-dive planner to preview future dives User-friendly interface and simple one-button operation for easy navigation Changeable battery and data retention saves settings even between battery switches History Mode records total number of dives, max depth, total diving hours and lowest temperature