Assembled Stack Light Units: Type - Stack Light; Signal/Lamp Type - Steady-On LED; Voltage - 18-30VDC; Number of Lights - 2; Colors Included - Green, Red; Mounting - Vertical Surface; Connection - Cable; Housing Color - Black Housing; Base OD - in - 1.97" (50.0mm); Additional Information - Bases and Covers : ABS, Light Segment: Polycarbonate, IEC IP67, NPN, Temperature Rating: -40 to 50 deg C (-40 to 122 deg F); Manufacturer Series - CL50