Hot Water Bottle Gel comes with a pocket for inserting your hand. The Hot Water Bottle is used to provide warmth, typically while in bed and for the application of heat to a specific part of the body. These are good for aches in cold climatic conditions and make you feel comfortable. They work on heat therapy and are used for joint pains, muscular cramps, menstrual pain, stomach or back ache, muscle pull, arthritic pain and ache from excessive sport activity. How To Use the Product : Firstly, please make sure to keep the hot gel pad on a flat surface while charging. Never keep it on a glass top while charging. Never use while charging. Does Not Require Filling Of Water just charge it and use it anytime, anywhere. Attach the adaptor to the hot gel bag and switch it on. Once the adaptor light switches off you can use it.