The Hotronic Footwarmer S4 unit is the highest end heater offered by Hotronic. It has a paper thin heating element that goes under the top sheet of your insole and will keep your feet warm!

Offers three (3) base level settings for comfort and warmth maintenance.

Provide a fourth (4th) “timed” setting for an extra blast of heat.

Powered by high capacity, cold temperature operation, NiMH AA cells.

NiMH cells do NOT have a “memory effect” and do not require fully discharging before fully recharging.

Temperature & Duration Chart
Setting	Approximate Average Temperature		Duration Range
	°F	°C
1	84 - 98	29 - 37	16.5 - 21 h
2	107 - 121	42 - 49	7 - 10.5 h
3	122 - 138	50 - 59	5 - 7.5 h
4	158 - 173	70 - 78	2.5 - 4.5 h
Based on Battery Pack in ambient temperatures of -22° to -15°C (-9° to +4°F). Based on Heating Element in ambient temperatures of 20° to 26°C (68° to 79°F).