I got one of these for Christmas gift and was intrigued, and what I found was it is like using a metal detector. Lots of noises and variations of those noises as I did what the instructions said and moved my hand slowly to scan for my car. But what I discovered is you have to listen for that highest-pitch blip amongst all the other sounds. Once you hear it, that is the direction you need to walk in. The other thing I found is that if you really don’t know where your car is, you are completely dependent on listening for the strongest signal and it really does lead you to your car. I also found that the green arrows work better than the sounds from farther away.