Budget Exterior Downlight for Walls with PIR Over-Ride

1) We want the on/off function - but I cant see the button on the picture. Do you simply close the cover on the sensor to switch the unit off? 2) Adjusting sensitivity. We have a similar light installed at the front of our house - and it's on most of the night owing to foot traffic. Can you adjust the sensitivity with this unit. Or just the timer (5-50sec)?
The PIR has an override function to activate turn the power supply on-off twice and within three seconds, to return to the PIR function simply repeat - on then off twice within three seconds. The built-in PIR has a 110º detection range, up to 8,000mm range, 10 lux to 2000 lux and 5 seconds to 50 minutes timer. These settings are easily accessible from the front of the light just pull down the cover above the sensor

Does this light have an adjustable detection range? It just gives a maximum 8000mm in description
Yes, the detection range is adjustable. These settings are easily accessible from the front of the light just pull down the cover above the sensor.

Does this luminaire have dawn till dust control?
No - the sensor only detects motion.