This simply indicates how many separate camera video streams they can record. DIY Home Security
They start from single channel devices going all the way up to 32. What level of video quality or resolution do you need?My usual recommendation of at least 1080p 2 Megapixels applies. Link
There are tons of substandard 720p HD Ready systems
you can get, but none of them will have the resolution needed to allow law enforcement positive identification of an intruder. Do you want
the ability to use wireless cameras as well?While I generally do not recommend using wireless for critical home systems such as security,Smart Smoke Detector
there are some situations where a wireless camera makes sense. Now you don’t need a WiFi enabled video survey
NVR to use a Wi Fi camera – this is a common misconception.