EF-550D memiliki dial retrograde dan juga fitur Tachymeter. Jam tangan yang tersedia dalam 2 pilihan warna, EF-550D-1A dan EF-550D-7A, sudah memiliki fitur water resistant 100 meter, sehingga aman digunakan saat berada di dalam air.
Spesifikasi EF-550D :
- Mineral Glass
- Partial ion plated
- Retrograde dial
- Tachymeter
- Screw Lock Crown
- Screw Lock Back
- 100-meter water resistance
- Case / bezel material: Stainless steel
- "Double-lock, 1-press, 3-fold Buckle"
- Stainless Steel Band
- Solid Band
- 1/20-second stopwatch
- Measuring capacity: 59'59.95''
- Measuring mode: Elapsed time
- Date display
- Regular timekeeping
- Analog: 3 hands (hour, minute, stopwatch seconds)
- 3 dials (timekeeping 24-hour, timekeeping second / stopwatch 1/20 second, stopwatch minutes)
- Accuracy: ±20 seconds per month
- Approx. battery life: 2 years on SR927W
- Size of case: 50.8 X 45.1 X 12.1 mm
- total weight: 181 g
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