Instruct: Classify Amazon reviews into positive or negative sentiment
Query: defects and more defects

I bought this collar at the recommendation of our dog trainer. It worked for exactly 3 days before the spray mechanism stopped spraying. After numerous attempts to resolve the issue with the seller I opted for a paypal refund and purchased another one. The second one lasted all of 4 weeks and it also stopped spraying.We weren't excessive sprayers, and even if we were the product should be designed to last somewhat longer than one refill.I couldn't be less happy with this product or the manufacturer.