An eco-friendly hot water bottle that heats up in 15 minutes wirelessly and retains heat for approximately 8 hours. - Model Name: Eco Hot Water Bottle nuku² - Features: Cordless, Soft Warmer - Heating Time: Warms up in 15 minutes - Usage Time: Lasts for approximately 8 hours - Electricity Cost: Approximately 2.5 yen per use - Brand Name: THREEUP Thank you for viewing.