Track your breath and depth with Garmin Descent Mk2i, an advanced watch-style dive computer that doubles as a multisport GPS smartwatch on land. This bundle also includes the Descent 1 transmitter. SubWave™ sonar technology allows integrated tank pressure monitoring on up to 5 tanks when paired with the included Descent T1 transmitter—ideal for instructors or group dives Descent T1 transmitter also lets you see remaining air time, air consumption rate and more for you and other divers within a range of 10 meters Comes with ABC sensors including an underwater 3-axis compass as well as surface GPS capabilities to mark your entry and exit points (GPS tracking does not work underwater) Dive log lets you store and review data from up to 200 dives right on your wrist Share and review dives in the Garmin Dive™ app downloaded to your paired compatible smartphone On land, the watch boasts multi-GNSS support, multiple sports apps, activity tracking estimates, wrist-based heart rate tracking, Pulse Ox and other advanced training features Pulse Ox sensor estimates blood oxygen saturation levels; this is not a medical device and is not intended for use in the diagnosis or monitoring of any medical condition Garmin Pay™ contactless payment solution lets you make convenient payments with your watch (not all countries and payment networks are eligible) Store up to 2,000 songs or access music streaming apps from compatible services (premium subscription may be required) Get smart notifications (when paired with a compatible smartphone) for calls, text, calendar alerts and more Elegant yet rugged design features a 1.4 in. color sunlight-readable display that's 36% larger than the previous model Battery life: up to 80 hrs. in dive mode; 32 hrs. in dive mode with T1 enabled; 16 days in smartwatch mode; 48 hrs. in GPS mode without music; 15 hrs. in GPS mode with music Battery life on Expedition GPS Activity mode can last up to 35 days; Battery Saver mode can last up to 50 days