Analogue twilight switch Sensor for wall-mounting included DIN-Rail mounting 17.5mm Two adjustment ranges 1-100/500-1,000 Lux Time delay approx. 8 seconds when switching ON & approx. 40 seconds when switching OFF Switching OFF value is approx. 1.4 times the value of switching ON Zero-cross switching for relay-saving switching IP54 (sensor), IP20 (control unit) protection