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Cameras can film continuously, only when triggered by a build in or connected motion detector, when you schedule, or when you remotely access the camera. They may or may not include a built in motion sensor. Cameras vary in the resolution quality of their film, in their field of view, and in key features built in microphone, light, night vision, etc. Security cameras typically offer two options for storing videos, either on a local SD card or on the cloud. Sometimes cameras offer both. For cameras that use the cloud, you may have to purchase a subscription to the cloud storage service, or the cloud may only come with monitoring. In rare cases, companies will offer stand alone cameras like SimpliSafe’s SimpliCam that offer free video streaming that you can access from your phone or computer. Indoor cameras range in size from practically invisible to a 6 inch tall device that sits on a flat surface. Outdoor cameras are exposed to the elements, so check that the camera you want to use outdoors is certified for that purpose. Outdoor cameras should be weather proof, vandal proof, and come equipped with night vision.