A CAM is a module that fits into the CAM slot in a Satellite Receiver, once the CAM is inserted into the CAM slot then you can put a Viewing Card in the CAM and access the Channels you subscribe to. If you have a Viaccess Card then you need a Viaccess Cam and if you have an Irdeto Card then you will need an Irdeto Cam and so it follows. We stock all available Cams Viaccess, Irdeto, Cryptoworks, Conax and others when and if they become available. Satellite CAMS will fit in all Technomate, VU and Mvision Satellite Receivers.