The rechargeable heating pad provides instant pain relief, sports injuries, arthritis, neck pain, back pain, toothache, menstrual cramps, hypothermia, sprains, chronic pain, and more. This rechargeable heating pad can be charged like a mobile phone and can be used continuously for 2-5 hours. Notice: 1. Rated voltage: 220V 2. Keep the bag dry before charging. 3. Remember to plug the power cord on the product into an outlet, and then plug it in. 4. The red light (indicator light) starts to display the heating process immediately. When the bottle temperature reaches 68-75 degrees Celsius, the red light goes out and the heating stops. 5. After charging, please unplug as soon as possible, and then take out the wire from the bag. NOTE: Do not reverse the program. 6. Do not touch the power cord and kettle when charging. 7. Before use, use the water injection tool to fill up with water, and there is no need to add water and change water later. 8. Keep Warm: Great for extra warmth and comfort on cold winter nights. 10 minutes before bed, fill up the hot water bottle and place it on the bed to keep it warm and comfortable. Suitable for everyone, including babies, children, adults and the elderly. This is the warmest gift for your family in winter.