The Omron E3ZM-R61 2M Photoelectric Sensor offers Square type, Retro-reflective , 100 mm to 4 m Sensing distance, NPN Output, Pre-wired cable length 2m, Red LED Light source, 10 to 30 VDC Power supply voltage, Light-ON/Dark-ON mode. Manufactured by Omron under the Omron Photoelectric Sensors category, this model belongs to the Omron E3ZM Series.