Revo Complete Professional 16-channel DVR Security Surveillance System features 8 cameras. Four of the cameras are 600TVL indoor/outdoor bullet cameras that can see up to 80 ft. in total darkness. The bullet cameras are capable of audio monitoring/recording and have pass thru mounting for no visible cables and are easy to install with the included 60 ft. of Revo all-in-one video/power/data/audio cable Quick Connect cable. Also included are 4 wireless high resolution bullet cameras broadcasting 600TVL of clear, high resolution video. For outdoor or indoor use, a 12-Volt power adaptor to power camera is included and the receiver portion is ready to be plugged into one of Revo Quick Connect Ports and be powered directly from the DVR. With a 3.6mm lens, the camera can transmit up to 450FT in optimal conditions. 30 IR’s allow the camera to see up to 80FT in total darkness and is also audio capable. The free Revo Mobile app will allow you to view your system live, monitor audio, search recoded video, even control PTZ cameras from most smart phones. Revo Remote will allow you to view from any internet connected PC in the world and Revo Remote PRO (a free software) will allow you to view multiple DVR’s at the same time. Mac user, Revo has an app for you too. The self-guided 1-2-3 set up is a user friendly system and will have you up and running in minutes. Recommendation: Only 4 wireless cameras should be connected to a DVR to insure that there is no video interference.