I took 2 of the six right out of the box. One of them I turned on right away to a clear strobe, but not as bright as the brighter strobe to see how long it would last. The second one I put on a full charge, then started the same strobe on it. The first one lasted for about 2 hours on the limited charge they sent from the factory. That's understandable. The second one has been running for OVER 10.5 HOURS now from the full charge and is still running!After recharging the first one again, I set it to the brightest strobe light to see how long it would hold up. I was expecting somewhere around 4 hours, but it didn't make it that long. It only made it 2.5 hours, but I'm okay with that knowing that I only have a maximum of 2 hours flight time on my drone with the three batteries I have. Plus, I have five other Led Strobe Drone Lights waiting in line to take its' place if need be.I fly my drone for Search and Rescue, so it's important to me to have a strobe light on during the day so my spotters can see it easily. The strobe that is not the brightest, is plenty bright to see in the daytime for about a half-mile. It can also be seen at night from about 3 miles away. The brighter strobe can double those distances. However, the maximum range on my drone is 5 miles, so I can't speak to any distances further than that.So far, I think the Led Strobe Drone Lights are really good and can only hope they will have some longevity. If not, I'll follow this up with an update and a lower rating.