Available in 90-watt and 65-watt. Heat-Troller™s provide you with multiple ways to control the heat output in your heated gear. Exclusive dual-zone heating system allows you to use the single or the dual Heat-Troller™ without rewiring the liner. Rated at 110 watts at 12. 8 volts Designed to be worn over a single layer of clothing like the TPG Basegear,a t-shirt or other lightweight garment. A protective outer jacket should always be worn over it Built to be temperature neutral, so that you can wear your liner all day and not have to change clothing when you need heat Lightweight soft nylon shell for minimum bulk, non-coated finish for maximum breathability Form fitting, snug fit for optimum heat transfer to body Heating pads on front, upper and lower back, sleeves and collar for full heat coverage Integrated glove plugs and pants plug stow in their own zippered pockets when not in use Flex panels and action back allow a full range of movement for any activity Fleece inner collar to wick away moisture Packs into its own zippered pouch 1-year limited warranty Heat-Troller™ is necessary for operation and sold separately. Must be plugged into a DC powersource or battery pack.