Choose 4 or 8 channel DVR, then add the Video Cables for the require length e.g. CAB10m, CAB20m, CAB40m or CAB80m. Next choose the IRCAM's to suite your requirements. Lastly choose LED monitor 15, 18, 21 or 23 inch The Cameras are power from the DVR unit & do not require Boxed Power Supplies. Please note these Units are for Video and Video recording, There is facility for Audio but ESP cameras are Video only.