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Altitude measurement (altitude / relative altitude); Air pressure measurement; Compass (electronic compass); 16 orientation; Metronome function; Time function: Hours minutes seconds and years (2000-2099) month day week 12/24 h; 2 set alarm reminding function; Countdown function (59"59 ~ 0); Stopwatch functions (0 ~ 99 hours 59 minutes 59 seconds 99); EL highlighting back-light function; 30 meters waterproof