Product Name: Hot Water Bottle (Set of 2) Size: 26 x 18 x 4 cm Weight: 1.66 kg [No need to change hot water / Rapid heat storage charging / Long-lasting warmth] This eco-friendly hot water bottle can maintain warmth for up to 8 hours with just 15 minutes of charging. [Portable cover with warming pocket / Gentle on skin] Comes with a soft-touch warming cover. It prevents air from drying out and maintains a gentle temperature for your skin. [Large size hot water bottle / Cordless / Use anywhere] The large size ensures long-lasting warmth. It's cordless, so you can use it anywhere and it's convenient for warming cold body parts. [6-layer explosion-proof design / Safe and secure] The 6-layer explosion-proof design and water-electricity separation design enhance safety. It automatically shuts off when the temperature exceeds 75℃. It is PSE certified and registered with the Ministry of Economy, Trade and Industry. Please use with confidence. [Economical & Energy Saving] No water or gas bills required for heating, costing approximately 2.5 yen per charge. It's also recommended for staying warm in winter. Charging Instructions 1. Open the cover of the main unit. 2. Place the main unit and the heat storage plug on a level and stable surface as shown in the diagram. 3. Fold down the arm and securely insert the heat storage plug into the heat storage outlet. 4. Plug the power cord into the outlet. The heat storage plug will light up, and heat storage will begin. 5. When the heat storage plug turns off, heat storage is complete. After completion, be sure to remove the heat storage plug from the main unit and the power plug from the outlet before use. About low-temperature burns: Low-temperature burns are burns that occur when the same part of the skin is in contact for a long time, even at a comfortable temperature (slightly warmer than body temperature). The temperature of the skin in contact with a hot object and the time it takes to get burned are approximately as follows: ● 44℃: 3 to 4 hours ● 46℃: 30 minutes to 1 hour ● 50℃: 2 to 3 minutes [Peace of Mind Guarantee] We accept returns within 30 days. If you are not satisfied for any reason, we will provide a full refund. Thank you for viewing.