Omron Retro-reflective Photoelectric Sensor 500 mm Detection Range PNP IP69K Block Style E3ZM-B81 5M. Electrical Connection: Pre-Wired Cable. Maximum DC Voltage: 30V. Optical Technology: Phototransistor. Terminal Type: 4 Wire 2m Cable. Light Source: LED. Maximum Current: 100 mA. Response Time: 1 ms. Housing Material: Stainless Steel. Minimum Operating Temperature: -40°C.