REVO"s Complete Professional 16-channel DVR Security Surveillance System features 8 cameras. The 4 indoor dome cameras feature 600 TV lines of high resolution to provide sharp, clear pictures. The day/night cameras come equipped with a mounting bracket and 30 infrared LEDs providing powerful illumination of up to 80FT in total darkness. The dome cameras are capable of audio monitoring/recording and have pass thru mounting for no visible cables and are easy to install with the included 60FT of an all-in-one video/power/data/audio cable with REVO"s exclusive quick connect cables for each camera. Also included are 4 wireless high resolution bullet cameras Broadcasting 600TVL of clear, high resolution video, this is the solution for adding a camera to monitor an area where running standard cable is just not an option. For outdoor or indoor use, a 12v power adaptor to power camera is included and the receiver portion is ready to be plugged into one of REVO"s 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. Convenient signal strength indicator and out of range warning allows you to easily set up for the best signal. 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. The system even has room to grow by having the capability to add eight additional cameras. Recommendation: Only 4 wireless cameras should be connected to a DVR to insure that there is no video interference.