Compact dive accessory attaches to high-pressure regulator ports, without interference from hoses Built to withstand the elements, the Descent T2 transceiver is dive-rated to 20 ATM (see Garmin.com/waterrating) — so you can dive deeper without worry Get tank pressure, air time remaining and air consumption rate sent directly to paired air-integrated Descent dive computers (sold separately) for enhanced situational awareness For improved communication, exchange preformatted diver-to-diver messages with other Descent T2 transceiver-networked buddies wearing SubWave network-compatible air- integrated dive computers up to 30 meters away (available with software v.15.70 or later) Pair up to 8 transceivers with each compatible air-integrated Descent series dive computer (sold separately) within range, so you can dive with multiple tanks or monitor your dive buddies’ air levels and depths up to 10 meters A simplified pairing process using BLUETOOTH Low Energy wireless technology makes it easy to identify your buddies’ names with the Descent T2 transceivers they’re wearing Descent T2 transceiver battery life: up to 100 hours of diving with a user-replaceable CR123A lithium battery