100 metres water resistant and with mineral glass; Depth gauge to 30M - Two built-in (pressure & temperature) sensors begin to measure water depth and water temperature at the start of the dive; Display unit 0.1 mtr or 1 foot. Submerged time measurement continues until returning to a depth of 1.0 metre below the surface;The measured submerged time, maximum water depth and maximum depth temperature are all stored in memory as log data;Barometer - 600 to 1,100hPa ;Thermometer - Display unit 0.1deg C ; Measures from -10.0 to 60 deg C. Altimeter - Measurement range -700 to 4,000M. Display unit 5m. Reference altitude setting; Low-Temperature Resistant, where the module is designed for operation at very low temperatures;Yacht Timer /Countdown Timer - The yacht timer is used to time the start of regattas where the countdown period can be set from 1 to 10 minutes. A signal is emitted after each minute has elapsed and then every second for the last ten seconds. Input range 1 min to 24 hrs. Progress beeper and auto repeat function; Blue EL backlight, with auto light switch function (allows light to operate when wrist is moved through 40 degrees; Anti-reverse Bezel - The bezel is designed to prevent rotatation in the wrong direction; Stopwatch measuring 1/100th second to 23.59' 59.99"; 5 Daily alarms, hourly time signal; Low battery indicator. Approx size 47mm x 47mm x 17mm. Approx weight 61g. Our price includes insured UK delivery.