The Hotronic S4 Footwarmer is a complete system to install the leading boot heating system into your ski, snowboard or hiking boots, or any footwear used in cold weather activities. The Power Plus S4 system is Hotronic's most powerful, longest lasting FootWarmer. New S4 battery maintains up to 55% of a full charge and 95% of the initial capacity after four years of non-use.
High-capacity, rechargeable NiMH batteries built for cold-weather operation. Four temperature settings via push-button controls.
Setting level one heats from 84 to 98 F (29 to 35 C) for 16.5 to 19.5 hours.
Level two heats from 107 to 121 F (42 to 48 C) for 7 to 9.25 hours.
Level three heats from 122 to 138 F (50 to 56 C) for 5 to 6.5 hours.
Level four: 158 to 173 F (70 to 76 C) for 2.5 to 4 hours. NOTE: Level four, can be used in three-minute intervals or continously, and is meant for a burst of heat. NOTE: Using longer may result in burns.
Battery pack LEDs indicate power on or off status and selected heating level. Lights blink when heating level four is selected to run continuously.
What's in the box: Kit includes two e4 batteries, two elements, charger, cambrelle covers and instructions. Does not include insoles, this kit installs on existing insoles, or on heat-ready insoles sold separately.