This deer alert just saved me, my family and the deer and our motor home from disaster.  Driving back from camping good thing I saw this young deer crossing the forested highway, I turned on this alert, slowed down, put my brakes slowly,  as you know motorhomes are like train, it does not stop on a dime but we noticed the deer walked faster and by the time our RV got closed it heard the louder alert and it ran faster on the side of the road.  I would rather have something like this device than nothing at all when venturing deer area.  I would install this on all my vehicles. I also have the whistle on the bumper, the deer didn't heard that.