AHD Security DVRs are a revolution to the CCTV security camera systems, utilizing coax cabling infrastructure now its possible to run high definition picture quality security camera system, AHD uses the same traditional cabling and simple plug and play method, same connectors and power setup, as initially launched AHD technology was able to handle up to 1.3mp 720p picture resolution and as it has evolved with time now AHD supports full HD 1080p video resolution at up to real-time speed, we have an updated selection of AHD DVRs that also support Analog and IP these AHD hybrid DVRs makes it possible to mix and match between your old CCTV analog cameras, AHD 720/1080p and IP cameras all at the same time, available in 4Ch , 8Ch and 16Ch.