The capacity of the SD card normally is 16GB or 32GB, and it's only for motion event recording. If you want remote viewing, like you want to get live streaming on your mobile phone when you are at work, connect the NVR to your network (connect the NVR to the router). You can also export the video to an SD card and transfer it to where you want it to be saved. You can play back the video later to check what's happening if you are not around there. Now you've succeeded to get the surveillance cameras recording on the NVR. You can set up the recording now, such as 24/7 recording, or motion detection recording (which means only when the cameras detect a moving action will the recording begin). Navigate to the video recording settings. The monitor will display the setting screen. Connect the NVR to a monitor (or an HD TV). Now the cameras and the NVR are connected to each other, and they can start communication. Make sure the products have power supply. Connect the cameras to the recorder, NVR. Let's take Reolink cameras and NVR as an example. Recording security camera video and voice to the NVR/DVR HDD is very simple. Steps for Continuous Recording Security Camera Video to NVR/DVR
Therefore, the best solution is to buy the cameras and an NVR/DVR from the same brand, or you can select a whole set. Many standalone NVRs and DVRs only work for the cameras from the same brand, and other brands' products may have incompatible issues. The most important thing you need to consider when recording security cameras is to select a suitable NVR or DVR. Only when you need remote viewing on your mobile phone or you want to get live streaming via a computer, will the security camera system access the Internet. And the recording won't mess up with your network, because they have their proprietary network to transmit the video, which means the video recording won't "eat up" your bandwidths.
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