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Here’s a close-up shot of the ISIS Powercell. It features the same rugged construction as the Mastercell and is tightly sealed against contaminants. The Powercell control unit is rated to operate in an environment up to 125 degrees (Centigrade). As with the Mastercell unit, the plastics used in the enclosures are UL 94V0 with bases of glass-reinforced nylon.