Case / Bezel Material: Resin Resin Band Mineral Glass 200-meter Water Resistance LED Light Selectable Illumination Duration (1.5 seconds or 3 seconds), Afterglow Multi Time (4 Individual Cities) World Time 31 Time Zones (48 Cities Coordinated universal time), daylight savings on/off, home city/world time city swap - 1/100-second stopwatch Measuring capacity: 23' 59.99 Measuring methods: elapsed time, split time, first time 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 alarm Hourly time indication Full auto-calendar (up to year 20999999) 12/24-hour format Button operation Tone on/off Regular timekeeping: hour, minute, second, pm, month, date, day Accuracy: ?ñ 30 seconds per month approx.Battery life: 10 years on CR2025 Case size: 50.5 ?? 50.4??13.5mm Net weight: 63g