Editorial Review:

Product Description:
Keep aggressive dogs away! Don't let an aggressive dog spoil your next walk, run, or bike ride! This Dog Repeller/Trainer assures you'll never be bothered by an aggressive animal again. It emits a harmless a high frequency ultrasonic sound that is heard by dogs but not by humans. Compact enough to clip on a belt or slip in a purse or jacket pocket. 1-'9V' battery not included.

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Rating: - Effective training tool
I use this to deter barking. It works! I'm currently using it to train a dog to stop jumping up on people. And it's worked for that too. I'm absolutely in favor of positive training methods and this works to catch the dog's attention without any yelling. Properly used (not within a foot of your dog's ears) it's an effective tool for most dogs, and would also be a good tool to keep unknown dogs away from you while walking.