Specifications Casing / bezel Material: Resin Strap Wristwatch Mineral Glass Resin Water resistance 200 meters LED lights Illumination duration can be selected (1.5 seconds or 3 seconds ), Glowing Multi Time (4 different cities) World time 31 time zones (48 cities + coordinated universal time), summer time on / off, city exchange Origin / city World time Stopwatch 1/100 second Measurement capacity: 23:59 ' 59.99 " Measurement mode: Elapsed time, split time, first-second position time Self-timer back Measurement unit: 1/10 second Time interval backward: 24 hours Distance time setting start time backwards: 1 second to 24 hours (1 second increment, 1 minute increment and 1 hour increment) 5 daily alarms or one time alarm Signal time count hour Calendar fully automatic (up to 2099) 12/24 hour format Voice button on / off operation Regular time accuracy: Hours, minutes, seconds, pm, month, date, day Accuracy: ± 30 seconds per month Estimated battery life: 10 years on CR2025 Case size: 50.5 × 50.4 × 13.5mm Total weight: 63g