This Gerbing splitter allows you to use a single controller, or On/Off switch, to run both a jacket liner and gloves needing a Dual Controller We do recommend that you purchase a Gerbing Dual Controller for ultimate riding comfort. If your feet get colder than your upper body, the Dual Controller will help make you more comfortable. When wearing a Gerbing Vest which does not have glove plugs, this splitter allows you to also power gloves, insoles or pants.