For example, in an apartment you may need one door sensor and one window sensor. In a large house, you may need two door sensors, eight window sensors, a garage door sensor, cameras, motion detectors, and more. If you know what you need going in, then you won’t pay extra for features and equipment that you won’t use. Most wireless security cameras on the market are for indoor use. At first glance, indoor security cameras may seem all alike, but they vary in key areas, such as when they film, video quality, video storage, and size. 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.