Whether your favorite activity is camping hunting or watching the ball game this vest with keep your mind on having fun not trying to stay warm. Operated by 7.4 VDC Lithium-Ion rechargable battery Battery weight: 58.5 g each Automatic temperature control temp keeps between 108 degrees F +/- 4 degrees and 93 degrees F +/- 4 degrees One heat setting with temperature regulator Temperature regulator will cut off the heat immediately when the temp reaches 108 degrees F Product Material: Shell: 100% polyester Lining: 100% polyester