I got these things on amazon for 15 dollari, i’ll put a link below comes with two strobes four batteries and stickies to mount on the drone. So wait for nightfall see how they do. ok, so drones on its way back, went up to 400 and easily could see what this little strobes i’m impressed. I got ta say this thing worked great, so was it worth the 15 bucks on amazon, i’m gon na say yeah? They work pretty well check the link below.