Fork width: 120 mm, light transmitter: LED, 640 nm pulsating, light type: red, alternating light, signal output: 1 NPN, short-circuit proof, reverse polarity protected, open collector, switching type: light/dark switching, connection: M8 connector, 4-pin, operating voltage: 10 ... 30 V DC, ambient temperature: -20 ... 60 °C (-4 ... 140 °F)