Foodpans maintain temperatures under 40°F for up to 8 hours - without ice or electricity! Eliminate the mess and inconvenience of ice and reduce the potential of bacteria. FYI: Pans should be placed in a freezer overnight prior to use. NSF. CALIFORNIA PROP 65 WARNING: This product contains a chemical known to the State of California to cause birth defects or other reproductive harm. For further information, visit their website.