Receiver won't charge

These worked for a while. One receiver still works so I can't give it anything less than 3 stars. The one still works (for now) and when it does work, it works great from keeping my one dog from barking, but doesn't prevent the other dog since that receiver won't charge anymore. I think the company has replaced 2-3 receivers since I first reported the problem. I would not recommend this product.

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