Low electrical drainage; less than 1 amp per insole Works on all 12 volt systems capable of operating a headlight Heaters stay in your boots and can be easily plugged and unplugged Specially designed stretch power cords allow flexibility and comfort even in low temperature Can be cut to fit most adult shoes sizes Kit includes: 1 pair of heated insoles, 1 special \"Y \" coil cord and complete instructions\n\nNOTE: The insoles\' power cord can be plugged into an optional 4-zone control module or a dash mounted hot jack (012-52004 sold separately) wired directly on the battery