The more you know, the better off you are. This is true for just about any aspect of life, including scuba diving. The Luna dive computer is the newest member of the Galileo family made by Uwatec. This state-of-the-art dive computer truly is a dive true bottom time calculator, a decompression dive planner, and a depth gauge, but it also offers features that simply make diving an even great sport to enjoy, such as a sleek design, a full-tilt compass with bearing memory, an extra large display for easy reading underwater, hose less gas integration, and the option for you to input your personal information (name, diver certificate number, emergency contact information, and so forth). The Luna"s alarms and signals will keep you safe at depth; the compass will keep you heading true, and the user interface will enable you to enjoy your dive without worrying about fighting with your computer while underwater. The Luna Dive Computer is a wrist mount computer that is water activated so if you forget to turn it on manual it will still calculate all aspects of your dive profile once you hit the water. Computer is altitude adjustable to 13,300" (4,000 meters) with full decompression and without decompression (gauge mode) at any altitude. Computer is powered by a user replaceable CR12600SE (SKU: AQUBY126) lithium 3 volt battery. The Luna also gives you wait to fly information, has a stop watch function, depth alarm, battery alarm, and a maximum depth rating for decompression