I accidentally bought two of these, so I'm selling one. I only checked to make sure it worked, so it's new and unused. It was sold on Amazon, but it's currently out of stock and there are no plans for a restock. The photos from the 6th image onwards are from Amazon. Brand: ZYQ The main body contains heat-retaining material and can be recharged repeatedly. The soft, fluffy fleece cover traps heat and keeps you warm. Since it's used without a cord, you don't have to worry about tripping over it. It can maintain a gentle warmth for about 6-8 hours when used in a futon. With just 10-15 minutes of charging, it can be used for a long time, so you can use it right before bed or when it suddenly gets cold. The electricity cost is only about 1.8 yen per use, making it economical. Even if you use it every day for a month, it costs less than 100 yen, making it more economical than a regular hot water bottle that uses water.