OMRON Photoelectric Sensor, Square Recess Shape, Retro Reflective Sensing Method, 4 m (When Using the E39-R1) Sensing, Red Laser Sensing Beam, 30 ms Response, 10 Output, 24/240 VAC, 12/240 VDC, 10 mA/3 A, 2 W Wattage, 50/60 Hz Frequency, Terminal Block Connection, LED Light Source, 10 to 55 Hz/1.5 mm Double Amplitude for 2 hr in X/Y/Z Directions Vibration, 80 mm H x 75 mm D Size, IP66 Enclosure, -25 to 55 deg C Operating, Surface Mounting, Environmental Conditions: 35 to 95% Non-Condensation Humidity