For more stress-free dives. The backlit Aqua Lung i550C Computer with Compass and Quick Disconnect starts working the second you hit the water. Gas-integrated, the computer calculates your remaining gas supply in real time for accurate gas management. Choose between Air, Nitrox or Gauge (with run timer). Easily read your data thanks to the backlight technology. Connect it to your DiveLog app on your smartphone for easy setup, view log, profile data, locations, and notes. Other safety features include audible alarms and a high-visibility LED warning light. Featuring fluorescent markings and large numbers, the compass guides you even in low light. Perfect for new and seasoned divers Water-activated; turns on the moment you hit the water Quick disconnect computer allows for easy storage 3 operating modes: Air, Nitrox, Gauge (with run timer) Nitrox mix to 100% O2 Salt or freshwater dive selection Pre-dive planning feature lets you preview your next dive Automatic altitude adjustment for more accurate information History mode displays your total number of dives, max depth, total dive hours, and lowest temperature Bluetooth integrated for easy connection with DiveLog app and wireless setup over your smartphone Includes i550 computer, quick disconnect, compass, digital instruction manual, safety reference info, a DiverLog brochure, a quick reference card, and a lens protector