...A@ Class II Photoelectric Sensors with Separate Digital Amplifiers (Laser-type Amplifier Units) E3C-LD11/21/31 Class II E3C-LR11 Class 2 (Laser Notice 50) CMOS-type Smart Laser Heads E3NC-SH2...https://www.ia.omron.com/data_pdf/guide/43/photoelectric_tg(further_info).pdf