The APRU is ready for Arctic temperatures! This icing test, performed by ETL / Intertek is part of NEMA4X qualification, required for equipment advertised as “outdoor equipment”. Apart from being water and dust-proof, the APRU has proven itself to be undamaged by the external formation of ice on the enclosure. Not only that, the embedded heater keeps its contents from freezing, meaning you’ll never have to worry about what’s inside.