Case / Bezel Material: Resin / Aluminum Resin Band Shock Resistant Mineral Glass 200-Meter Water Resistance LED Backlight (Super Illuminator) Auto Light Switch, Selectable Illumination Duration, Afterglow. Flash Alert Flashes With Buzzer That Sounds For Alarms, Countdown Timer (Time Up), Hourly Time Signal Multi Time (4 Different Cities) World Time 31 Time Zones (48 Cities + Coordinated Universal Time), Daylight Saving On/Off, Home City/World Time City Swapping 1/100-Second Stopwatch Measuring Capacity: 23:59'59.99'' Measuring Modes: Elapsed Time, Split Time, 1st-2nd Place Times Countdown Timer Measuring Unit: 1/10 Second Countdown Range: 24 Hours Countdown Start Time Setting Range: 1 Second to 24 Hours (1-Second Increments, 1-Minute Increments and 1-Hour Increments) 5 Daily or One-Time Alarms Hourly Time Signal Full Auto-Calendar (To Year 2099) 12/24-Hour Format Button Operation Tone On/Off Regular Timekeeping: Hour, Minute, Second, Pm, Month, Date, Day Accuracy: ±15 Seconds Per Month Approx. Battery Life: 3 Years on CR2016 Size of Case: 55.1 × 52.5 × 16.3 mm Total Weight: 69 g