The C3 controller is used to control access to a building or area through a door. It is an IP-based system, which means that it uses the Internet Protocol to communicate with other devices on a network. The C3 controller is available in three different models: the C3-100, which is designed to control one door; the C3-200, which is designed to control two doors; and the C3-400, which is designed to control four doors. Each model is equipped with a variety of features and capabilities that can be tailored to meet the specific needs of the building or facility in which it is installed.
