Bigger and better than ever, the ProPlus 4.0 features the latest Bluetooth 4.0 technology. Now divers can adjust and customize all their dive features on the go pre-and post-dive. ProPlus 4.0 boasts a new display area, wider font size, and 22% larger digits than its predecessor (ProPlus 3), making it clearer and easier-to-read than ever before. With Bluetooth compatibility, ProPlus 4.0 adds to Oceanic's commitment to growing the largest family of Bluetooth compatible computers available to divers. Specifications FEATURES & FUNCTIONS ProPlus 4.0 Modes of Operation AIR, NITROX, GAUGE Push Buttons 2 Mounting Options CONSOLE Activation Water or Push Button Algorithm Basis Modified Haldanean / DSAT (Diving Science and Technology) Database / Z+ Altitude Algorithm Basis NOAA O2 Limit Basis NOAA Tissue Compartments 12 (5 to 480 minutes) Automatic Altitude Adjustment 2,000 - 14,000 ft / 610-4200 m Decompression Capability 10 - 60 ft (3-18 m) Automatic Safety Stop Prompt YES Cylinder Pressure and Air Time Remaining YES Audible Alarm YES Alarm Acknowledgment (U/W Deactivation) YES Ascent Rate Range 3-9 m/min - 6-18 m/min Ascent Rate Maximum 30 fpm (<60 ft) - 9 m/min (<18m)60 fpm (>60 ft) - 18 m/min (>18m) OceanGlo Backlight (Push Button) YES SmartGlo Backlight (Sensor) YES Diver Replaceable Batteries YES Battery Type CR2 Battery Life 300 HOURS Battery Hot Swap (retains calculations) YES Low Battery Indicator (Graphic) YES Calendar / Clock YES Operating Depth (Max) 330 ft - 100 m Operating Depth (Gauge Mode) 330 ft - 100 m 12/24 Hour Time to Fly Countdown YES Calculated Desaturation Countdown YES