Thank you for viewing. An electric hot water bottle that heats up in about 12 minutes and can be used for approximately 5-8 hours. ✼ Type: Electric hot water bottle ✼ Heat retention time: Approximately 12 minutes ✼ Usage time: Approximately 5-8 hours ✼ Electricity cost: Approximately 2.5 yen ✼ Safety design: 3 safety features ✼ Power consumption: 400W I am selling this because I have the same one.