The Shearwater Petrel 3 gives divers the most connected experience. A stunning, easy-to-read, 2.6Amoled display is protected by a toughened glass lens, titanium bezel, and piezo touch buttons. Air integration is standard with up to four Shearwater transmitters to customize a solution from open circuit to rebreather and bailout gas pressure monitoring. Safety is increased with a strong vibration alert system, and a user-changeable AA battery offers long dive times and ease of replacement. The Petrel 3 is available in standalone or rebreather monitoring models, including DiveCAN, 4-pin AK, and Fischer port connections. Multiple Diving Modes Show Air / Nitrox / 3 Gas Nitrox Three gas nitrox computer with features for the serious recreational diving enthusiast. Includes adaptive safety stop and NDL bar graph Optionally air integrated OC Technical Trimix enabled by default Optionally air integrated CC/BO Closed Circuit/Bailout Trimix enabled Constant PO2 for closed circuit Optionally air