Mares Mission Puck 2 Dive Computer-AS-ONE Segment Display: Needle-sharp information combined with intelligent placement of information for easiest readability. One Button: Control Full-featured computer in which all functions can be accessed through an intelligent and intuitive logic with a single button. Puck computer in an ergonomic console. New gauge display for easy readability Multiple attachment loops for flexible configuration Air, Nitrox and Bottom Timer modes. EAN (NITROX) from 21 to 50 percent