signPRO Electronic sign ballast for T12/HO and T8/HO lamps. IntelliVolt operation: 120V to 277V, 50/60 Hz. Energy Efficient DOE Nov. 14, 2014, compliant1. Instant Start, parallel lamp operation. Maximum performance under all weather conditions. UL Listed (Class P, Type 2 Outdoor), CSA Certified, RoHS Compliant. Meets FCC Part 18 For Non-Consumer Equipment. Maximum case temperature (Tc): 194F, 90C.