The selection of stair monitoring camera shell is not the same as the selection of indoor camera shell. Because the monitoring of stair is slope-like, a slightly larger camera shell can be considered, such as the new 60/75/85 # camera shell. When selecting these types of camera shell, you should pay attention to the shell that can be installed with infrared light, because the stair monitoring light is neither indoor nor outdoor, Therefore, infrared camera monitoring is required to make the monitoring picture clear. The size of the HS-85T monitoring camera shell is just enough to install high-definition CCD version and infrared light.