NSI Tork® Photocontrol, Pencil, Series: 2020, 120 VAC, 50/60 Hz Frequency, 2000 W Tungsten, 1800 VA Ballast, SPST Contact Form, 2 min Timing, 16 AWG Wire, Cadmium Sulfide Cell Sensor, 1 to 5 fc Turn On/3 to 15 fc Turn Off Sensitivity, Environmental Conditions: -40 to 140 deg F Operating Temperature, Surface Mounting, Lexan®, 1-5/8 in Dia x 4-7/8 in H Dimensions