It can be customised: One of the hallmarks of DVR is the way that it can pre-empt what clients want. For example, certain companies or individuals might want to see CCTV integrated with motion detection. DVR can actually film what is happening on a motion detection setting if that is what is chosen in order to give a customised profile of what is happening in terms of surveillance.
It has diverse settings: DVR can pick up a wide range of settings (such as choice of recording resolution: Half D1-half the job, D1-same as a dvd 720x520pixels and CIF-lowest) because it does not have a 3D approach when it comes to surveillance. This is important for stakeholders such as local councils who have a duty to keep the community safe.
Frame complexity is a benefit: As a general rule, the more frames captured per second, the more technologically advanced your DVR system is. FPS means Frames Per Second. Companies in industries where there is a duty of care to protect information at all times such as financial services require DVRs which have strong frame technology that can withstand a flurry of activity. Generally, the recommended FPS rate for number of cctv cameras being used is as follows: If you're buying 4 cctv cameras you'll want a 100FPS DVR, for 8 cctv cameras = 200FPS, and for 16 cameras=400FPS.
Always choose H.264 Compression (over MPEG-4). The H.264 technology is superior and carries some nice benefits, such as not using as much disk space to store digital images/videos, and works much faster over the internet where remote streaming is of interest.
Another tip is to look out for PC enabled DVR devices which are easier to watch if you need to look at surveillance for prolonged periods of time. - Thankfully cctvsystems.org.uk only supply H.264 DVR's and the latest proven software & cctv technology.