Dial in your comfort level with a simple turn of the dial! Unlike older rheostat type thermostats, Gerbing's digital temp controllers draw just enough current to maintain the heat you need. The lowest setting draws very little power. Plus, a red light on the controller goes on when the unit is drawing current or goes off when it is turned off. This dual controller allows you to control two different heated garments separately. This just plugs in between the battery harness and the heated garments.