After 10 days of Owls attacking other rabbits, squirrels, etc. in my yard and leaving remnants on my pool cage, I was ready to try anything! I found this site and ordered 4 Nite Guards, hoping it would work. I am so happy to say that from the day of placing these on 4 locations facing different directions… NO MORE OWLS! I have waited to see if they would return before writing this review… as of now, 2 weeks later, no problem. They are water resistant and are bright and flashing. Thank You!