EFA-121D memiliki tampilan dan fitur yang hampir sama dengan EFA-122D. Hanya bentuk dari EFA-121D saja yang berbeda. Jam tangan seri ini memiliki bentuk layar bulat.
Spesifikasi EFA-121D :
- Mineral Glass / Spherical Glass
- 100-meter water resistance
- Case / bezel material: Stainless steel
- "Double-lock, 1-press, 3-fold Clasp"
- Stainless Steel Band
- Electro-luminescent backlight
- Auto light switch, afterglow
- Thermometer
- Display range: -10 to 60 °C (14 to 140 °F)
- Display unit: 0.1 °C (0.2 °F)
- Thermometer Measurement Timing: During each even-numbered minute
- *Changeover between Celsius ( °C) and Fahrenheit ( °F)
- World time
- 30 time zones (50 cities), city code display, daylight saving on/off
- 1/100-second stopwatches
- Measuring capacity: 99:59'59.99''
- Measuring unit: 1/100 second (the display for the first 60 minutes)
- 1 second (the display after 60 minutes)
- Measuring modes: Single stopwatch mode: lap times, total elapsed time
- Dual stopwatch mode: two independent lap time measurements, lap time differential
- Memory capacity: 50 records (used for lap times and total elapsed time)
- Other: Lap numbers (01 to 99); best lap time and lap number in newest log
- Countdown timer
- Measuring unit: 1 second
- Countdown range: 100 hours
- Countdown start time setting range: 1 minute to 100 hours (1-minute increments and 1-hour increments)
- Other: Auto-repeat
- Daily alarm
- Hourly time signal
- Auto-calendar (to year 2099)
- 12/24-hour format
- Button operation tone on/off
- Regular timekeeping
- Analog: 2 hands (Hour, minute;hands move every 20 seconds)
- Digital: Hour, minutes, seconds, am/pm, month, date, day
- Accuracy:±30 seconds per month
- Approx. battery life: 3 years on SR927W X 2
- Size of case: 48.4 × 44.9 × 13.1 mm
- Total weight: 153 g
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