The Garmin Descent Mk3i is the 3rd generation of Garmin`s smart dive computer, 

• Air integration (up to 5 tanks), using SubWave Sonar data network
• Transmitter range, up to 10m
• Multiple dive modes (air, nitrox, trimix, CCR, apnea)
• Customizable dive screens
• Stores up to 200 dives
• Share dives with Garmin Dive app
• Surface GPS (logs entry/exit point)
• InReach compatible
• Diveview color maps with depths
• Built-in LED flashligh
• AMOLED Display
• Built-in Performance Metrics and PacePro
• Animated workouts, on the watch screen
• Heart rate and Pulse Ox monitor
• Safety/Indecent tracking
• On watch music (via BT headphones)
• Garmin Pay, music, and notifications

Compatible with T1 Tank Transmitter