These Professional cameras capture high quality images to protect your business, office, and home all day and all night and are a great choice to expand or upgrade a current system or replace older worn out cameras. The set of four cameras are packaged complete with everything needed for installation. The cameras are manufactured with a 1/4 inch color image sensor that provides a sharp image and have a high resolution of 500 TV lines. Each camera has 24 infrared LEDs which provide light that is invisible to the human eye but will illuminate up to 40 feet in total darkness. A built-in CDS Sensor (light sensor) turns on the 24 infrared LEDs in darker environments providing light for better video capture and off again in brighter environments. Clover added an infrared cut filter (IRC) to each camera that mechanically slides the filter in front of the lens to filter out the infrared light during the day substantially increasing the video capture quality. These added features make these true day and night cameras. Because the cameras have a video composite output, they are interchangeable with most other systems using the cable that is included. The included cable combines video and power eliminating the need to run two separate cables during installation. The cameras are made of sturdy anodized aluminum with an adjustable visor and can be used inside or outdoor. The adjustable visor is designed to help reduce sun glare increasing the possible installation locations. The mounting bracket is easily adjustable and can be attached to the bottom or the back of the camera providing more versatility. Everything needed to install all four cameras is included in one convenient package. Very easy to install -just plug and play but if help is needed just call our friendly technicians and they will be glad to help.