Japanese-made pet hot water bottle, heated in the microwave, provides warmth for approximately 30 minutes. - Product Name: Yuka Hot Pet Hot Water Bottle - Color: Brown - How to Use: Microwave-heated type - Made in: Japan - Compatible Microwave: 500-600W - Usage Time: Approximately 30 minutes I bought a bunch of these last year for my dog. He caught a cold and had a fever, and the vet told me, "You have to keep him warm!" This is my third pug, and I was surprised that a dog could catch a cold ∑(゜Д゜) I rushed to buy this and a down coat for walks. This one is unused. It's starting to get cold, so I'm offering it to someone who's looking for one♪ I'm also selling a different color. I use "Yutapon" (a similar product) in the winter, and it's eco-friendly because you just microwave it. It keeps your feet warm, and you can sleep soundly. It's a great product♪ I don't necessarily need to get rid of it, so I won't accept price negotiations.