[Warm Tips] - Charging time is 8-15 minutes and will automatically power off after it is safe to do so. Note: Please refer to the user manual before using for the first time. This electric water heater is not filled with water. Customers will need to fill it with water themselves. [Pain relief for comfort] - With its classic colours and soft glove, the multi-purpose hot water bottle is perfect for treating sore muscles, stress or cramps, soothing fatigue, back pain, menstrual pain and other common aches and pains. A must-have for every household. [Strong insulation] - Made of 6 layers of PVC protection, eco-friendly and durable. Thicker plush fabric keeps warm for longer and resists pressure. The insulation lasts for 2-4 hours outdoors, 3-6 hours indoors and 6-10 hours at night when you sleep. [Safety explosion-proof charger] - Safety explosion-proof charger. The micro switch on the power unit automatically closes when the bag expands to the appropriate level. Each charging unit has been subjected to thousands of power failure tests to ensure product safety. [Anti-leakage design] - Water and electricity are separated for safer use. Stainless steel heating tube, 361 degrees even heating, with impermeable insulation outside the heating tube to avoid the risk of leakage or electric shock when heating. The heated water can be made of non-corrosive natural water without any odour, which can be used with confidence.