The Descent X30 dive computer features a vibrant 2.4-inch display and a housing and bezel made with recycled ocean-bound plastics. With four large metal buttons, up to 30 hours of battery life and support for multiple dive profiles, it&&';;s perfect for your next dive. What You&';ll Love Display type LCD Water rating Dive (100 meters) General Strap material silicone Lens Material Chemically strengthened glass Bezel Material fiber-reinforced polymer Case material fiber-reinforced polymer QuickFitA(R) watch band compatible yes (26 mm) Physical size 78.7 x 61.8 x 24.7 mmSilicone band: 140-360 mm Weight no bands: 160 gwith bands: 198.2 g Leakproof inductive buttons Yes Display Size 2.4" diagonal Display resolution 320 x 240 pixels RGB Color display Yes Large font option Yes Battery type Lithium ion Battery life Medium brightness (default): 30 hoursHigh brightness: 10 hoursNight dive: 47 hours Charging method Garmin proprietary clip charger Memory/History 4 GB Clock Features Time/date yes GPS Time Sync Yes Automatic daylight saving time Yes Stopwatch Yes Sunrise/sunset times Yes Sensors GPS Yes GLONASS Yes Galileo Yes Compass Yes Gyroscope Yes Accelerometer Yes Thermometer Yes Ambient light sensor Yes Depth sensor Yes Daily Smart Features Connectivity BluetoothA(R), ANT+A(R) Smart Notifications Yes Text response/reject phone call with text (Android(TM) only) Yes Weather forecasts Yes Realtime settings sync with Garmin Connect(TM) mobile yes (also with Garmin Dive app) Smartphone compatibility iPhoneA(R), Android(TM) Passcode Yes Activity Profiles Dive Diving Tactical Features Dual grid coordinates Yes Diving Features Dive activity maximum operating depth 100 meters Single-gas mode Yes Multi-gas mode Yes Gauge mode Yes Decompression model Bu;hlmann ZHL-16c with gradient factors Nitrox support Yes Trimix support Yes Gas mixes Air, Nitrox and Trimix, up to 100% O2; 1 bottom gas and up to 11 deco and/or backup gasses. PO2 Up to 2.0 with customizable deco PO2 setting Auto start/end dive Yes Custom end-dive timeout yes (20s to 10 m) Safety Stop yes (customizable off/3min/5min) Deep Stops yes (using custom gradient factors) Customizable conservatism yes (low/medium/high or custom using gradient factors) Dive ascent/descent rate indicator Yes Automatic altitude adjustment Yes No fly time yes Dive planner yes (basic NDL + multi-gas deco planner) Backlight yes (configurable intensity; always on) Automatically saves dive entry and exit locations Yes Sync dive log to Garmin Dive(TM) Mobile app Yes Custom dive data screens Yes Alerts & alarms Audible and vibration alarms for ascent rate, PO2, CNS/OTU, NDL, deco, gas switching. Customizable (up to 40) audible and/or vibration per dive mode, based on depth or time 3-axis dive compass yes (with adjustable heading, quick change to 90R, 90L and reciprocal). Indicates degrees and direction back to set heading Missed Deco Lockout yes (can be disabled prior to dive with user acknowledgement) Residual Tissue Loading Reset yes (on the surface with user acknowledgement) Surface diver status widget yes (surface interval, N2/HE loading, CNS, OTU and tissue compartment status) Boating Features Built-in barometer and tide tables yes (downloadable tides) Training, Planning and Analysis Features GPS speed and distance Yes Touch and/or button lock Yes Activity history on watch Yes Outdoor Recreation Point-to-point navigation Yes Explore Nearby Yes Reference point Yes Distance to destination Yes GPS coordinates Yes