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Recording device which is a part of a CCTV camera system. The DVR replaces time lapse recorders as well as Multiplexers. They are composed of a computer hard drive and video inputs.Typical configurations include 4 channel, 8 channel, and 16 channel.
There are many advantages to using a digital video recorder such as motion activated recording.

Recording times are based on the amount of disk space available and the frame rate specified

[tag]Security cameras[/tag] that can see in very low light conditions are considered low lux. More specifically the lower the lux the less light  a cctv camera needs to produce a video image.A camera with a lux rating of .05 lux for b/w and .5 lux for color cameras is pretty standard. Today’s low lux cameras have a rating of .0003 

A camera with this low lux rating would almost be able to see in star light