Firehouse Technology ARC Blue Strobe

I bought four of these strobe units for my drones. I attach one on top and/or one on the back using Velcro. Activate upon take off, and turn off on landing. There are four tiny strobe ”bulbs” on each of these and they are VERY BRIGHT!! I use them on my drones for EVERY flight. Even in the brightest sun I can still see the strobes blinking away even when up at max (400ft) altitude. Really visible against a grey/cloudy sky. I’m not one for flying my drone too far away (always less than a mile and ALWAYS with the strobes) and these strobes work fine. I’ve read a couple of reviewers claim they can see them when 3 miles(!) away! Haven’t tried that. I charge them up after a session of flying, or when they run down (since I have four I just change them out when needed). I use small sections of “high grip” Velcro to hold them in place (fuzzy part on the drone).