Hotronic recommends recharging when Battery Pack is off. (Battery Pack is off when all LEDs are off.) However, Battery Pack MAY be recharged at any setting. If recharging while on setting 1, 2, 3, or 4, DO NOT CHANGE SETTING DURING RECHARGING as this may cause recharging process to stop.
CAUTION: READ ALL INSTRUCTIONS PRIOR TO USING FOOTWARMER
CAUTION: USE OF FOOTWARMERS MAY RESULT IN BURNS