Outdoor Hazardous Area Station, Multi-Party Line, 24 VDC operation.NRTL certified for use in US and Canada,- Class I, Div. 1, Groups C and D; - Class II, Div. 1, Groups E, F, and G; - Class III, Div. 1, Consisting of: Amplifier (Model 7805-002) and Enclosure (Model 10444-003)