Within ±15 accuracy per month (when worn at normal temperatures of 5°C to 35°C / 41°F to 95°F) Operating Temperature Range 0°C to 55°C (32°F to 131°F) Analog Display Functions Time: seconds, minutes, hours, 24 hours, UTC minutes, UTC hours, mode Digital Display Functions Time: Seconds, minutes, hours, city name, daylight savings time, A/P Calendar: Month, date, day, city name Alarm 1, 2, 3: Hours, minutes, A/P, city name, ON/OFF Chronograph: Chronograph hours, chronograph minutes, chronograph seconds, chronograph 1/100 seconds, SPL, 24 hour measurement Timer: Timer remaining minutes, timer remaining seconds, set minutes (timer setting range: 99 minutes to 1 minute in 1 minute units Zone setting: Display setting and cancellation for each city, setting of ON/OFF for daylight savings time for each city Additional Functions Switching between main time (analog) and sub-time (digital) Power Save 1: Automatically stops second hand movement and digital display Power Save 2: Automatically stops watch functions Manual Power Save: Enables watch functions to be stopped arbitrarily (forcibly) Power indicator: Approximate indication of secondary battery charging level Insufficient charging warning function Overcharging prevention function Continuous Running Times Fully charged to stopped: Roughly 4 years (when Power Save 2 function is operating) Two-second interval movement to stopped: Roughly 1.5 days Approximate Measurements Glass diameter: 28.5mm Case diameter: 45mm (including crown) Case thickness: 14.5mm Weight: 200g