C4-Smart is an access smart controller which designed with full metal housing in small size. The industrial spare parts and high quality materials can make it run well under bad environment in temperature from -35 ℃ to 70℃, and power consumption is lower. Once power is off, it will activate data protected function, all information will be saved safely and timely. This controller supports TCP/IP, installation is simple and convenient, user can manage all doors in one software. And we can also set anti-pass back function for the exact door or defined area freely!