This set of stopwatches arrived within a week and a half of ordering (3-5 days before the anticipated delivery date), however, 3 of the 6 stopwatches stopped working correctly within 4 days of opening them. The first one stopped working correctly on the 2nd day of using it, going blank on the screen, resetting the time, and the buttons were sometimes very sensitive, and sometimes you had to push quite hard to make them work. We tried changing the battery, but the problem persisted, and then two more stopwatches started having the same problems. Amazon said they will give me a full refund, so I'm returning the whole set since it would be cheaper to get a new set than to replace them individually. I gave 3 stars since half the stopwatches have worked so far, but they're just not reliable enough to keep all or any of them.Also, as a side note, the blue stopwatch was dark blue, not light blue as pictured.