Brunton Heatsync Zone Folding Mat with USB Powered Heat, Black Multi Function Power Mat - Overall Dimensions: 13.5" Width x 38" Length Perfect for sleeping bags, chilly fall soccer games and car seats Powered by any Brunton Portable Power device with 2.1 lamp USB output Two foot USB extension cord included to place battery where you want it Heatsync pre-heat function powers up at full heat for 5 minutes, then backs off to 80% power