The BOS 23K-PA-RD10-S4 is a diffuse photoelectric sensor from Balluff's 23K series, featuring a detection range of 0-2000 mm. It operates with 10-30 VDC power supply and has PNP output configuration with NO/NC switching capability. The sensor comes with an M12 male 4-pin connector and emits red LED light for status indication. Model number BOS01FM.