Further information for Pepperl + Fuchs PF retro reflective sensor (PRT) 254272 - OQR50M-R300-2EP-V1
Operating range: 0 ... 50 m, light type: red, alternating light, signal output: 2 push-pull outputs, short-circuit proof, reverse polarity protected, connection: device connector M12 x 1, 4-pin, operating voltage: 10 ... 30 V DC, ambient temperature: -40 ... 55 °C (-40 ... 131 °F)