This is the Mares Genius Scuba Diving Wrist Computer WITH LED Tank Module Transmitter Features: Latest Addition to Mares Instrument Line Up Full Color High Resolution Display (TFT) TFT LCD Display: Mineral Glass Lens, 2.7 (68.6mm) Diagonal Display Window Newest ZH-L16C Algorithm w/Gradient Factors and Predictive Multi-Gas Functions Suitable for Air, Nitrox and Trimix /Capability of Up to 5 Gases Full Tilt Digital Compass w/Bearing Memory & Stopwatch for Precious U/W Navigation Compass Tilt Up to 80Ø Hoseless Air Integration Function Optional Hoseless Air Integration Function Monitor Up to Five Transmitters at Once Great Computer Choice for Dive Guides and Instructors Altitude Adjustable to Approximately 12,100' (3,700 m) Depth Display: 492' (150 meters) Timekeeper: Quartz Movement Provides: Time, Date & Dive Time Clock Menu: Allows Set Time Format (12/24-hour) Time, Date, Time Zone Shift Wake-Up Alarm Bottom Timer Mode w/Resettable Average Depth and Stopwatch Functions Decompression Dive Planner w/Additional Surface Interval Function Precious Calculation of Deco Dive Activities Brilliant Logbook with Multiple Graphs Logbook Capacity: More than 1,000-Hours of Dive Profile at 5-Second Sampling Rate Smart Battery Management System: 40-Hours of Dive Time per Full Charge Bluetooth Connectable for Direct Connection to Smartphone Night Mode Function for Low Light Conditions Map Viewing Function During Dive Tissue Saturation Graph with Detailed Information Underwater Menu Allows Settings Changes During Dive Future Deco and Runaway Deco Alarm (proprietary) Function Units of Measure: Imperial or Metric Set for Fresh or Salt Water Future Deco and Runaway Deco Alarm (proprietary) Function Transmits tank information Color LED for quick tank check on the surface Color LED alerts buddy of low air situation during dive Permanent pairing EN250:2014 certified to 300bar Battery type: CR123A, user replaceable The Mares Genius Wrist Dive Computer is the latest addition to Mares instrument line up. This full color high resolution display computer is powered by the newest ZH-L16C algorithm with gradient factors and predictive multi-gas functions. Computer is suitable for Air, Nitrox and Trimix with a capability of up to 5 gases. Computer has a full tilt digital compass (up to 80Ø) with bearing memory and stopwatch for precious underwater navigation procedures. Computer can monitor up to five transmitters at a time with optional transmitter making it a great choice for dive guides and instructors. Computer is altitude adjustable to approximately 12,100' (3,700 m). Depth display is 492' (150 meters). Time is kept by a quartz movement providing time, date and dive time. The clock menu allows you to set the time format (12/24-hour), time, date, time zone shift and wake-up alarm. "