Insulation & heat absorbing material keep proper temperature for the insulin inside. Heat absorbing material automatically recharges whenever VIVI CAP is in ambient temperature of less than 82.4°F ( 28°C ).
Temperature indicator is activated for few seconds, after pressing a button.
VIVI CAP1 works always! Everyday for years, and should be replaced if after pressing the button , while in room temperature, no indicator light is observed.