I.R.I.S. 075 - Manual (Page 10)

To do this, whilst the camera is powered up, tightly cup your hands around, or
cover around the IR sensor on the front of the camera, making sure no light
can get onto the face of the sensor. After a few seconds the LED should
operate and you should see a feint red glow around the IR illuminator. The
image on your screen should have also switched from Colour to Monochrome.
Operation
Now the camera is installed, powered up from a suitably rated and protected
12VDC power source and the video is hooked up to the monitoring (or
switching / recording / routing ) equipment, the camera is ready for use.
During the daytime or in areas where there is sufficient light, the camera will
produce a crisp colour image. As light levels drop the image may appear
slightly grainy as the video gain is increased automatically until the day/night
filter kicks in when the light levels are sufficiently low. At this point the camera
image will switch to monochrome producing a sharp image up to around 30
feet. When the light levels rise sufficiently the camera will automatically switch
back to colour.
Iris Innovations: IRIS106 User Guide. v1.00 072013