Features:<br> Time, Chronograph, Stop Watch, Alarm, World Time,30m Water Resistant， Countdown, Date, Month, 12/24h, Back Light <br><br> Size:<br> Dial diameter:33*35mm, Thickness:10mm, Band Width:15mm<br><br> Material:<br> ABS/plastic case, Glass crystal<br><br> Quartz watches operate on the principle that the quartz emits a fixed frequency under voltage, so the time of the quartz watch is very precise.<br><br> What is the scarcest resource in the world? No doubt it is time. If this watch is fortunate enough to be worn on your wrist, it will show its value and you will get a time assistant.<br><br> After-sales service: If you have any questions, please feel free to contact us. Our professional after-sales service personnel will solve it well. You can also choose to replace the same product or a full refund. You won't have any loss.