Instruct: Classify Amazon reviews into positive or negative sentiment
Query: This product is garbage

I bought two of these for my miniature poodles. To sum it up: This product stinks. The range is horrible. It doesn't work from across the room. It doesn't work in sunlight. It doesn't work from in a doorway. It doesn't work from in the hall. You get the picture. If you need to correct your dog you have to be right next to him... and then it still doesn't work sometimes. Everyone knows that the key to training a dog is consistency, and how are you supposed to be consistent with such a sporadic product? Bonus surprise: You can't use two of these at once. They use separate codes for each unit but the signals interfere with each other and they are sporadic at best.I am returning mine, and I would never recommend this product to anyone. I won't even bother mentioning what's good about this product because it is so fundamentally defective.You cannot train a dog with this product.