Suunto D4f is a robust Freediving Computer that makes a huge difference in the way you dive. When diving, the D4f displays your present and maximum depth and calculates dive time as well as surface intervals for you instantly and automatically allowing to properly recover between dives. Use the apnea timer to improve your breathing technique. After the dive you can browse the details of your dive from the logbook. The light-weight case with stainless steel bezel and mineral crystal glass make Suunto D4f not only a trusted tool when exploring the depths, but also looks good wearing day to day.