Industrial photoelectric sensors transmit fixed wavelengths of light to determine the distance, absence, or presence of an object by ignoring ambient light and detecting changes in the transmitted light returning to its receiver . Specifications: Manufacturer : Omron Length : 20mm Model : E3Z-D81 Height : 33.2mm Width : 10.8 mm Amplifier Type: Built-In Category : Sensors Connection Method : Pre-Wired Features : Light ON / Dark ON Light Source: Red LED Maximum Operating Temperature : + 55 C Minimum Operating Temperature : - 25 C Operating Supply Voltage : 24 V Output Configuration : PNP Packaging : Bulk Product Type : Photoelectric Sensors Sensing Distance : 4000mm Sensing Method : Retroreflective Series : E3Z Package Includes: 1 x Omron Automation and Safety E3Z-D81