Don’t trust your life to them I have seen many vehicle’s with so called deer whistles on them hit deer.
They used to be big in Wisconsin but mostly have went a way as being ineffective.
We kill over 30,000 deer here each year.
Which one do you have.
We have relatives in the midwest where they have more deer than cows.
One couple had the deer whistle decades installed years ago and never hit a deer. Another relative couple bought a Harley like their relatives with the deer whistle. They didn’t buy a whistle and had a couple of close calls. Then, they and a 200# white tailed tangled. He ended up in deer heaven and they ended up in the ER and later an OR. They limp a little and can predict rain or snow storms with their deer injuries. They did not remember seeing the deer hit them. It was probably running fast and right into their Harley it happened after dark.
When they got their new replacement Harley, their relative installed a deer whistle on it and then installed deer whistles on their vehicles. That was over a decade ago and their Harley and vehicles have remained deer free with the whistles.