Description:Material:Copper WireFeatures:Reverse charging resistantRed clamp connect to the positive(+)battery teminal，black clamp connect to the negative(+)battery teminalDo remove the clamps in 30s after the vehicle startedDo not connect the red and black clamps，if not，it may lead dangerous.Voltage: 12VPackage Included:1 X Power Battery Clip Wire(not included start a power supply)