8PCS Deer Whistles for Car, Automotive Save a Deer Whistles to Avoid Collisions, Vehicle Deer Warning Devices Horn Sensor, Universal Animal Alert Car Accessories (Black, 8 PCS)

My previous devices were more traditional horn shape and came off frequently in car washes. These have survived 3 washes so far. I used two per vehicle. There is no info from seller about one or two per vehicle. Horn syle usually are each different pitches. These are dual holes, so assuming each is complete by itself. I mounted so they are very slightly pointed off center to better hit sides of roads. I normally see deer frequently, have noticed a decrease in them. I mounted one set under a civics front bumper and mine in the grill on my Nissan Pathfinder.

Came in fast! Easy to install. Perfect size. Adhesion is great. Appearance, they just blend right in to the bottom front bumper of my Equinox. Great Value! So far, performance is as described.

Whistles are rather loud when you blow them, the stickers are quite a challenge to work with. Let's hope they alert the deer as intended.

Would be great except didn’t get the 4 red adhesive stickers to attach to grill !

They seem to work I haven’t had any of them walk out in front of me yet

I've been through the car wash several times and these are still holding on strong! I would highly recommend

Good product and quick delivery.

I drive along a 20 mile stretch of road in the middle of the night every day. There are no street lamps, and there are tons of wildlife. I have seen everything from possums to raccoons to alligators. One thing that is a constant is deer - I always see them grazing on the side of the road. So I attached my whistle to the bottom of the front of my vehicle (pictured). The first thing that I noticed is how extremely sticky the adhesive is - after all you don't want it getting knocked off by the high winds at driving speeds. It attached very easily to the bottom of my bumper, and it has been on for 2 weeks now without coming off. I drive anywhere from 55 to 70 mph, and there has been no indication that it is even loose. I have also noticed that there has been no wildlife along the road since I've been using it, not even a deer. It could be a coincidence, but I ALWAYS see deer along the side of the road. I believe this whistle has scared them off. It doesn't make any noise to me, but it is supposed to be audible only to animals.