I would not even give this product one star except that I could not leave this review without giving at least one star. This product does not work at all. My dog thinks it is a toy. The only thing she reacts to is the red light, which she chases and barks at. My dog does not react to what is supposed to be a high pitched ultrasonic sound, how would we even know if it emits a sound, we can't hear it! Her lack of reaction proves there is no sound.
This is a scam! Do not waste one penny on this product. I checked with the BBB just before writing this review, they gave this company an "F" rating! I wish I had checked the rating before I wasted good money on it.
Length of Use: 3–6 months
Bottom Line: No, I would not recommend this to a friend