We have had problems with our flares on crash scenes going out in heavy rains–when they positively had to work they didn’t. I submerged the PowerFlare in a bucket of water overnight, then took it apart and it was bone dry inside. We tested it in a variety of night time lighting conditions, of course, while being driven over. We are happy to say that the PowerFlare not only met but exceeded our expectations. It puts out almost as much light as a flare but does not go out in the rain or put holes in your pants and raincoat. It took a wicked beating and worked without a hiccup on all settings. Please see our first order for a set of four. More orders will follow as we will be outfitting all our squads with a set. Thanks for a great product!