Case: Stainless steel
Accuracy per month: ±20 sec
Battery Type: SR927W
Battery Life: 2 YRS
1-second stopwatch
Measuring capacity: 59′59
Measuring mode: Elapsed time
Accuracy: ±20 seconds per month
Approx. battery life
2 years on SR927W
Date display
Regular timekeeping
Analog: 3 hands (timekeeping hour and minutes, stopwatch seconds), 3 dials (timekeeping 24-hour and seconds, stopwatch minutes)
Size of case / total weight
EF-540D …… 51.0 X 45.2 X 12.4 mm / 176 g