This Keystone KTEB-228-1-TP-PH-SL 120V Compact Fluorescent (CFL) Ballast is cUL, FCC Part 18 (Class B), Sound Rated: A, UL certified and works in temperatures ranging from 0oF, -18oC -> 167oF, 75oC. This product is recommended for Commercial use, with an input voltage of 120V and 50/60 Hz input frequency.