Using the default H.265, the NVR can record four channels for up to 3 days at the maximum 8192kbps bit rate, but if you feel you need more, you can add 6TB internally (swap the hard drive) and 6TB externally (eSATA socket), for a total of 36 days, so there is plenty of flexibility. With four 4K cameras and 2TB of storage, this camera and NVR (Network Video Recorder) combination set is a powerful security system that will give you the power to monitor most properties without further investment – and you have the option to support up to 8 Reolink IP cameras if required. ‘Human’ rather than individual person detection

With a separate camera you will, of course, need a compatible system. PoE also covers live streaming, conferencing, and broadcast setups, so we've not forgotten them, but you might prefer to check our best streaming camera and best PTZ camera guides. If you want to break things down into more detail, there is an FAQ below the main list, but the main thing to be mindful of is that this list covers systems – with drives and power boxes – and separate cameras. That’s why a lot of security camera systems are actually low-spec computers built with slightly different priorities when it comes to the ports (quite a lot of LAN sockets for the cameras, VGA or HDMI for the display, and a hard drive, but not too much else). An Ethernet cable can carry enough power to operate a surveillance camera and it goes without saying that handling a digital video via network is no problem. The range is limited only by the cable and not thick walls blocking Wi-Fi. PoE technology is simpler than older “Siamese cables,” while avoiding the need for regular battery charging.

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