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FEATURES:1. The product has been filled with galvanothermy energy conversion agent, which helps it to warm up quickly and keep warm for a long time.2. Commonly, after charging for 7-12 minutes, it can be used for 2-10 hours, which is 2 hours for hand warming or 10 hours for quilt warming.3. It has automatic temperature control to avoid being overheated, starts heating when the lights start shining and stop when the light is extinguished. 4. The product is explosion and leakage-proof.5. The protection device installed inside can restrain air expansion, and the vinyl film and high-strength complex fiber guarantee no leakage of the product.INSTRUCTION:1. The manufacturer has filled the product with water and a galvanothemy energy conversion agent.2. Charging for heating; Insert the power cord into the socket on the product, then connect the power. It starts heating when the light starts shining, and after 7-12 minutes when the light is extinguished, the product turns into constant temperature status. Turn off the power supply, take off the power cord from the product, and you can use the product.CAUTION:1. Before every heating, please check the tightness of the water affusion plug, and make sure the power socket is upward. Do not charge when the product is sideways or inverted.2. Please do not use the product when it is being charged. 3. Person who is hypoesthesia to the temperature is not allowed to use this product.4. Babies and kids are not to use this product.