Surat Dream Portable Heating pack is designed to be a warmer for hands, feet, neck, shoulders, back aches, cramps, sore muscles, and many more uses. Convenient USE The hot water bottle will be filled with water by yourself only, it is non-toxins and chemicals added, you just need to charge to heat the bottle, and you have no need to change water every time like the rubber bottle Comfortable & Soft The heating pack is soft and comfortable, it is made with high grade velvet fabric on the outer shell and double thick and flexible PVC sheets inside. Multi-purpose --- Hot Water Bottle/ Heating Pad/ Hand Warmer Mode of Operation The operation is simple. Connect the charging cable to the charging plug available in the pouch. Switch on and allow the gel bag to heat for 5-10 mins. Make sure not to overheat. A 5-7 min charging is enough to remain heated for 2-4 hours. You can simply use the heated pouch or bag on the painful areas.