Puck 4 Bühlmann 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