This Keystone is cUL, FCC Part 18 (Class A), Sound Rated: A, UL certified and works in temperatures ranging from 0oF, -18oC -> 194oF, 90oC. This product is recommended for Commercial use, with an input voltage of 120-277V and 50/60 Hz input frequency. A 3 Year warranty is also included in the unlikely event a problem arises!
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