Velvet Electric Pain Relief Heating Bag These product has been filled with energy which help us warm for long time after charging for 7 to 12 min it can be used for 2 to 5 hours which is 5 hours for hard warming and 10 hours for quit warming , it is automatic temperature control avoids over heating These products is leak  and explosion proof , a protection device is there which avoids the inside air to expansion the product is high strength and fibre is good quality Runs on Electricity no hassles of heating water on gas or heaters. You can keep it inside the quilt to heat up the quilt or use on low temperature for massaging body parts An electric hot water pouch used to provide warmth, typically whilst in bed, but also for the application of heat to a specific part of the body. It is a high quality reliever from aches in cold climatic conditions. Gives relief from pain and makes you feel comfortable. Very useful product for the winters   Read Less