Easy to use and convenient as you can change the power setting at any time during your day; there\'s even the option of no-heat for when you just don\'t need to be any warmer. Provides warmth for up to 22 hours; 3 different heat settings and ultra-thin heating elements mean you\'ll have toasty feet in no time. Included in the set are 2 battery units, heating elements and cables, self-adhesive cover for footbed and USB charging cable (wall charging plug not included).