How does it work, or does it work? How: the hologram picks up the light and changes colors and also makes a noise as it twirls in the wind. Jury is still out on IF it works. My friend Betsy used it in her mother's carport, and it did keep the birds out.
I was hot to get a plastic owl until I saw that they were $20 AND ospreys had built nests right next to the plastic owls that the power company put at the top of electric poles.