HOTRONIC E4  FOOT HEATER WARMER
The Hotronic Power Plus E4 has four cells in each battery pack and is Hotronic's most powerful-yet-compact FootWarmer!  Easily installs in all types of footwear.  Can be transferred quickly from one pair of footwear to another.  Keeps you warm during skiing, snowboarding, hiking, fishing, and other general winter activities.  Powered by high capacity, cold temperature operation, NiMH cells.  Four (4) temperature-duration settings for ultimate comfort.