The light feature comes on constantly but the whistle either didn't work at all or had no effect on my dogs. I have had 10 dogs in the last 20 years, with 4 currently, and have always had products like this work. Needed a new one and saw this. Easy to return and customer service was very nice, however, I am responsible for shipping both ways ($16 total). Not worth it for an item that may be broken. Will not recommend.
Pros and Cons:
Bottom Line: No, I would not recommend this to a friend
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