The Suunto D4f is a light yet tough dive computer, that makes freediving safer and fun. While freediving, the D4f displays your current and maximum depth. It also calculates dive time and surface intervals with plenty of alarms, allowing you to maintain safe dive time and avoid DCI. The dive logbook allows you to analyse your dive sessions. The case consists of a stainless steel bezel and mineral crystal glass making the Suunto D4f not only a versatile dive computer, but also a good looking timepiece.