SecurityMan SM-400MC - Manual (Page 9)

Up to 35ft of night vision
Infrared LEDs
5
3. Adjust brightness, contrast, hue, saturation, and color of the
TV/monitor to perfection.
Night Vision
The built-in infrared LEDs provide up to 35ft of night vision for 24-hour
surveillance. The IR LEDs are automatically activated when the amount
of light is not adequate to capture a good image. While in night vision
mode the picture will become black and white or monochrome.