DESC: The ease of use gives the Pro Plus 2 a leg up on any other computers on the market. Set the time and you don't even have to turn the computer on as you jump in the water. The computer does it all for you. On top of that, if you wish to set alarms based on depth, time, nitrogen loading, or oxygen loading, the menu system is updated and easy to use. Lastly, using the optional PC download kit, you can save your dives and view them anytime! This classic PDC features the largest display available and our patented Air Time Remaining calculations built right in. The Pro Plus 2 is "air-integrated", constantly monitoring your cylinder pressure and comparing it with your personal air consumption rate and decompression status to deliver your personal Dive Time Remaining based on the most limiting factor.