When we do our taxes we always have a calculator handy. Don't leave your dive safety to plastic tables and pencil and slate, use a calculator! Get ready for easy, electronic multilevel dive planning with the arrival of the new eRDPML. Like its predecessor, the eRDP, the eRDPML is not a dive computer, but an electronic dive table that allows you to plan single depth and multilevel dives. While the first generation eRDP provided the same information as the table version of the Recreational Dive Planner (RDP), the eRDPML provides similar information as The Wheel Þ in an electronic format. The Professional Association of Dive Instructors (PADI) eRDPML allows you make 3 or more single depth repetitive or 3 consecutive multi-level repetitive dives in a day with the ease of a digital calculating table system. Once you open the eRDPML protective lid you will find basic instructions and safety rules for use. The water resistant keypad allows you to plan dives in imperial or metric (feet/meters) units of measure and have audible sounds for key strokes and warnings. The eRDPML runs on one user replaceable 3.0V, CR2032 lithium battery. Typical battery life is one year with an average use of 10 minutes per day. If the display dims, it indicates that you should replace the batteries in the compartment on the back of the eRDPML. Comes with an owner's manual.