51mm dive computer and smartwatch. Pair with inReach devices and the inReach dive case. Multiple dive modes for single and multiple gas dives. Pair with Garmin Descent T2 transceivers (sold separately) for integrated pressure monitoring on up to 8 tanks via the SubWave sonar data network. Featuring SubWave sonar-based communication and diver monitoring, this advanced, air-integrated Garmin Dive Computer and Smartwatch comes with Garmin innovations to help prepare you to make the most of your diving experience plus multisport training and smart features for your active life out of the water.