In field conditions (under natural night illumination of 0.05 lux) the unit can detect objects at a distance of up to 500 meters, and recognize them within a 230-270m. range.

Lastly, Nightstand Central's bonus feature is the "flashlight" (a white screen basically, but adequate illumination in the dead of night), which you can turn on and off by shaking your handset.

The functional significance of the day and night changes of the photoreceptors and their relations to natural light illumination were discussed.