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A digital security camera is one of the main components of a CCTV system. There are many different types of security cameras available in the market.  One of the main things to consider before buying a digital security camera is, if the usage is going to be indoors or outdoors.  If the need is for the outdoors then there is a special type of mount and housing needed to protect against extreme cold and hot which the outdoor cameras have to go through.  For cold there may be heater in security camera housing and for hot temperature a fan. The camera case also needs to be water proof to prevent water damage to the camera. Also the type of camera lenses will be different for outdoor security camera which needs to have an auto iris lens for the best results in capturing outdoor images.