The PETREL 3 gives divers our most connected experience. A stunning, easy-to-read, 2.6” AMOLED 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. This model includes a Fischer port connection. The External Monitoring Mode provides real time PPO2 monitoring of 1 - 3 O2 sensors.