Temperature Control Digital Control with two temperature displays. One display shows the set temperature, the other shows the actual temperature in the freezer.Alarm System Battery operated alarm system will emit an audible and visual signal when there is a mechanical or electrical failure. The alarm has an over and under temperature setting, alarm silencing switch, and battery test switch. Remote Alarm Relay A relay for a remote alarm hook-up is also provided. Refrigeration System So-Low cascade type. Two hermetic compressors. CFC & HCFC free refrigerants.Construction Chamber is 14-ga. zinc coated galvanized steel. Exterior is 16-ga. steel. Powder coated cool gray finish.Voltages Available 115/60/1 - 208/60/1 - 230/60/1 - 220/50/1