Garmin Descent Mk2i, Watch-style Dive Computer with Air Integration, Multisport Training/Smart Features, Titanium with Black BandTrack your breath and depth with Descent Mk2i, the watch-sized dive computer. It features SubWave sor technology for integrated tank pressure monitoring on up to 5 tanks when paired with the Descent T1 transmitter (Additiol equipment (sold separately) and device pairing required), making it ideal for instructors or group dives. Descent Mk2i comes with ABC sensors with an underwater 3-axis compass as well as surface GPS capabilities to mark your entry and exit points (GPS tracking does not work underwater). On land, Descent Mk2i doubles as a premium multisport GPS smartwatch with multi-GNSS support, multiple sports apps, wrist-based heart rate monitoring estimates, Pulse Ox (this is not a medical device and is not intended for use in the diagnosis or monitoring of any medical condition) sensor, advanced training features, Garmin Pay payment service (not all countries and payment networks are eligible), music storage, smart notifications (when paired with a compatible smartphone) for calls, texts and calendar alerts and more.Garmin HRM-Pro, Premium Heart Rate Monitor Chest Strap, Real-Time Heart Rate Data and Running Dynamics, BlackFeaturing dual transmission, the HRM-Pro premium chest strap lets you share accurate heart rate data with your Garmin device, compatible fitness equipment and third-party training apps, such as Zwift. It also helps you improve your running form by providing running dynamics, including vertical oscillation, ground contact time, stride length and more. HRM-Pro stores heart rate data when you hit the water then automatically sends it to your device after your swim. During team sports, it also monitors steps, calories and intensity minutes then syncs with your Garmin watch. Go on, and push your performance to the next level while wearing one of our most comfortable heart rate straps yet — with a battery you won’t need to replace for up to one year.