Watch for free diving and snorkeling Free diving and underwater fishing operations: Waterproof up to 100m Diving time Surface time (between dives) Water temperature Memory of the last 99 dives Alarm max depth Alarm max dive time Watch Functions: Double time (global and local) Alarm clock Date 100 years Illuminated screen Stopwatch Countdown Pedometer with sound tempo Wrist circumference max 25cm CR2032 battery 2-year warranty