This is the Atmos Mission One Smart Wrist Watch Scuba Dive Computer Features: Design for Best Diving Experiences Powerful & Intelligent Dive Computer Advanced Alarm System Provides Effective Vibration & On-Screen Notifications Sync w/ATMOS App, View Dive Site's GPS & Keep Diving Stories Sleek & Robust Construction Most Desirable Dive Companion Display: 1.2 (30.5mm) Diameter Sunlight-Visible, Transflective, Hi-Res Color Outstanding Readability Resolution: 240 x 240 Pixels Constant Backlight, Ideal for Murky Waters & Night Dives Easy to Use Menu w/Intuitive User Interface Multi-Lingual Adjustability: English Simplified Chinese Traditional Chinese Japanese Korean 100 Dive Memory On-Board Unit Exploration: Constant On-Screen Digital Compass Easy to Set Compass Bearings Mark Entry & Exit GPS Locations Dive Spot GPS Guidance GPS Does Not Work Underwater Smart Dive Companion Digital Logbook (ATMOS App) Smartphone Notification Depth Rating: 328' (100m/10ATM) Construction: Case: Fiber-Reinforced Polymer Lens: High Strength Anti-Wear High-Transmission Glass Bezel & Buttons: 316L Stainless-Steel Wrist Band: Silicone Dimensions: 2.0" x 2.0" x 0.70" (50.5mm x 50.5mm x 18mm) Weight: 3.17 oz. (90 g) Metric or Imperial Units of Measure Modes: Air, Nitrox, Free-Dive, Gauge &, Off Single Gas Design (Oxygen 21-40%) Decompression Algorithm Model: Buhlmann ZHL-16c (GF configurable) Power: Rechargeable Battery Charge Time: 2-Hours Battery Life: Up to 40 Hours In-Diving (backlight off) Up to 15 Hours (backlight mid) & In Time Mode Up to 10 Hours In-Turn-On Smart Notification Mode In-Water Activation Dive Planner Depth & Time Alarms w/10 Sets Each for Free Dive Mode Alarms: Visual, Vibration & Audible Buzzers Surface Time, No-Fly Time Freediving Stopwatch Sunrise, & Sunset Times Residual Tissue Loading Reset Clock: 12/24-Hour Formats Firmware Upgradable Connectivity w/ATMOS APP (iOS / Android) Includes: 2 Screen Guards, Charging Cable, & Quick Start Guide Design for the best diving experience the Atmos Mission One is a powerful and intelligent dive computer. Its advanced alarm system provides effective vibration and on-screen notifications. By syncing with the ATMOS App, you can view the Dive site's GPS and keep your unforgettable diving stories. Sleek and robust construction make it the most desirable dive companion to ensure your best diving experience. Ultimate diving experience: 1.2" (30.5mm) sunlight-visible, transflective, hi-res color display provides outstanding readability with a resolution of 240 x 240 pixels. Vibration, visual and audible alarms. Constant backlight, ideal for murky waters and night dives. Easy to use menu with intuitive user interface. "