Omron Retro-reflective Photoelectric Sensor 10 → 200 mm Detection Range PNP IP67 Block Style E3T-SR24. Electrical Connection: Pre-Wired Cable. Maximum DC Voltage: 26.4V. Optical Technology: Phototransistor. Light Source: LED. Maximum Current: 50 mA. Response Time: 1 ms. Housing Material: PBT. Maximum Operating Temperature: +55°C. Minimum Operating Temperature: -25°C.