Operating range: 0 ... 20 m, light transmitter: LED, light type: red, alternating light, 640 nm, signal output: N-channel MOSFET, short-circuit proof, switching type: light switching, connection: fixed cable 2 m, operating voltage: 20 ... 250 V AC/DC, ambient temperature: -20 ... 60 °C (-4 ... 140 °F)