The F.10 dedicated freediving watch comes equipped with everything you'll need for one deep breath. Provides digital depth, elapsed dive time on the surface and underwater, and a generous collection of customizable audible and visual LED alarms and interval prompts for ultimate performance and safety.Freedive Mode Main displays Depth and Elapsed Dive Time with access to either a pre-set countdown timer or lap timerUser defined surface recovery timer, repeating elapsed dive time alarm, repeating depth interval alarm and 3 max depth alarms - with flashing LED and auto-backlight illumination99 dive log with Max Depth, EDT, Surface Interval:01 step profile scroll – EDIT and DepthHistory Mode including total EDT and number of dives, Max depth ever with its EDT, Longest EDT ever with its Max Depth, Average Max Depth, EDT, and number of dives per dayDigital watch functions including alternate time zone, chronograph, daily alarm, and countdown timerOptional PC Downloadable with 1 second sampling rateUser-Replaceable BatteryUser settable depth activation for shallow water trainingUser updateable firmware - with optional cableSalt / Fresh Water settingImproved time and depth settings resolutionRepeatable countdown timer for interval trainingAdded history for the last session (resets at midnight, or may be manually reset)