Rechargeable heat-retaining hot water bottle. - Design: Camouflage pattern - Power source: Rechargeable - Material: Soft fabric Thank you for viewing. You charge it and use it by putting it in a round, fluffy fabric bag. I have a lot of electric foot warmers and kotatsu because I get cold easily, and this one is rechargeable, so I can use it anywhere, which is appealing. I used it for one season, but I am organizing things due to moving, and I have home-cleaned it, but please refrain from purchasing if you are concerned. #HotWaterBottle #Rechargeable