Casio EFR-539BK-1A

    Case size (L× W× H)
    54.1 × 49.5 × 11.7 mm
    Weight
    185 g
    Case and bezel material
    Case / bezel material: Stainless steel
    Band
    Stainless Steel Band
    One-touch 3-fold Clasp
    Water resistance
    100-meter water resistance
    Power supply and battery life
    Approx. battery life: 2 years on SR920SW

    Glass
    Mineral Glass
    Back plate
    Screw Lock Back
    Surface treatment
    Black ion plated band
    Black ion plated case

    Stopwatch
    1/10-second stopwatch Measuring capacity: 59'59.9'' Measuring modes: Elapsed time, split time, 1st-2nd place times
    Accuracy
    Accuracy: ±20 seconds per month
    Other features
    Regular timekeeping: Analog: 3 hands (hour, minute, second), 3 dials (stopwatch 1/10 seconds, stopwatch minutes, stopwatch seconds)
    Date display