This is the Mares PUCK 4 MISSION 3 Dive Console with Slate for Scuba Features: Puck 4: Bu;hlmann ZH-L16C algorithm with customizable gradient factors User-replaceable battery (CR 2450) with a long battery life of 100 dives Integrated Bluetooth for direct connection to a smart device Firmware update via the Mares app Pressure gauge: Brass case Technopolymer window Phosphorescent dial Colors used to indicate tank pressure for intuitive readability Console: Protective thermoplastic elastomer console Two large eyelets for attachment points Grip area Colored details around the gauge dial and on the back Enhance your dive kit with the Puck 4 Mission 3, a powerful combination of a dive computer and a pressure gauge in a sleek console. The Puck 4 features the Bu;hlmann ZH-L16C algorithm, a user-replaceable battery, Bluetooth connectivity and firmware updates via the Mares app. The pressure gauge boasts a brass case, a technopolymer window and intuitive color-coding for tank pressure. The console, with a protective elastomer case, ensures durability and ease of use, with large attachment points and colored details for visibility. Choose the optional Compass Module for added navigation capabilities.