This is the Oceanic Geo 4.0 Wrist Scuba Diving Computer Features: Geo 4.0 is the next evolution in a long line of stylish, everyday-wear dive watches rich in features for active, mobile and value-driven outdoor enthusiasts. Geo 4.0 includes an all new sporty look and Bluetooth connectivity to smartphones for the ultimate in user experience and adjustability. Bluetooth 4.0 Connectivity Oceanic's Exclusive Dual Algorithm: Buhlmann ZHL-16c Based PZ+, or DSAT Based 2 Nitrox Mixes to 100% Oxygen Deep Stop with Countdown Timer Intuitive User Interface with 'Step Back' Audible Alarms with User Acknowledgment Gauge Mode with Run-Timer History Mode and 24 Dive/99 Free Dives On-Unit Log Book 'Last Dive' Display: Max Depth and Dive Time Diver-Replaceable Battery with Data Retention User Upgradeable Firmware Power: CR2430 Lithium Battery Operational Depth: 330' (100 meters) Altitude Adjustable: 3,001' to 14,000' (916 to 4,200 meters) Dual Time Display and Daily Alarms Backlight for Night or Low Light Conditions 4 Operating Modes: Watch, NORM, Free Dive and Gauge Time, Date & Temperature Electronic Device Interface (with Bluetooth) Geo 4.0 is the next evolution in a long line of stylish, everyday-wear dive watches rich in features for active, mobile and value-driven outdoor enthusiasts. Geo 4.0 includes an all new sporty look and Bluetooth connectivity to smartphones for the ultimate in user experience and adjustability. Geo 4.0 has a brand-new stylish and sporty look! It features an updated display area with larger, crisper digits, Oceanic's patented Dual Algorithm 5 optional color straps, and Bluetooth connectivity to all smartphones through the DiverLog+ App for the ultimate mobile experience. New and experienced divers can dive anywhere with Geo 4.0 and stay connected in style.