Review on 🦌 4 Count Auto Deer Whistle - Ultrasonic Wildlife Warning Device to Save A Deer - Easy Mount Adhesive for Auto, Motorcycle, Truck, SUV, ATV - Black by Kevin Brianne

I don't see their value because I don't know how well they work. I drive at night and meet a lot of deer. I bought them after I found one. It was fairly easy to install and stuck well. After installing the deer whistle, I encountered another deer on the road and it didn't seem to notice or respond to the whistle. It worked when I blew the horn so I'm not sure if the whistles work or not.