Product Name: Set of 2 Hot Water Bottles Size: 26 x 18 x 4 cm Weight: 1.66 kg 【No Need to Replace Water, Rapid Heat Storage Charging, Long-Lasting Warmth】 Environmentally friendly hot water bottles can maintain warmth for up to 8 hours with a 15-minute charge. 【Convenient Portable Cover with Insulation Pocket, Gentle on the Skin】 Comes with a soft-touch insulated cover. It doesn't dry out the air and maintains a skin-friendly temperature. 【Large-Sized Hot Water Bottle, Cordless, Usable Anywhere】 Large size provides long-lasting warmth. Cordless, so it can be used anywhere, convenient for warming cold areas. 【6-Layer Explosion-Proof Design, Safe and Reliable】 Safety is enhanced with a 6-layer explosion-proof design and water-and-electricity separation design. Automatically turns off when exceeding 75°C. PSE certified and registered with the Ministry of Economy, Trade and Industry. You can rest assured. 【Economical & Energy-Saving】 No need for water and gas bills from electricity use, and it costs about 2.5 yen per charge. Also recommended for winter cold対策. Charging Procedure 1. Open the cover of the main unit. 2. Place the main unit and the heat storage plug on a horizontal and stable surface as shown in the diagram. 3. Lower the arm and firmly insert the heat storage plug into the back of the heat storage outlet. 4. Plug the power plug 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 with something that feels comfortable (a temperature slightly warmer than body temperature) for a long time. The approximate skin temperature in contact with a hot object and the time it takes to get burned are as follows: ● 44°C for 3 to 4 hours ● 46°C for 30 minutes to 1 hour ● 50°C for 2 to 3 minutes 【Peace of Mind Guarantee】 We accept returns within 30 days. If you are not satisfied, we will provide a full refund. Thank you for viewing.