These are classic cameras. Their signal is transmitted on coaxial cable. They have high-quality resolutions that have evolved over time as the technology improved. At the moment, 8MP is the highest resolution. Also, you can go for the cameras with lower resolutions of 5MP and 2MP. The kits come with infrared technology that ranges from 20 to 80. Though the infrared is fixed, you can choose 20, 30, or 100m. Colour and Starlight cameras are also available to let you see colours and images, even in the dark.