Bio-based resin band Resin Glass Water Resistant LED backlight Selectable illumination duration (1.5 seconds or 3 seconds), afterglow LED:Amber Multi Time (4 different cities) World time 31 time zones (48 cities + coordinated universal time), daylight saving on/off, Home city/World time city 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 alarms or one-time alarms Hourly time signal Full auto-calendar (to year 2099) 12/24-hour format Button operation tone on/off Regular timekeeping: Digital: Hour, minute, second, pm, month, date, day Accuracy: ±30 seconds per month Approx. battery life: 3 years on CR1616 Size of case : 37.8 × 33.7 × 8.6 mm Total weight : 23 g