The CR9 is an RFID proximity reader that uses the Wiegand communication protocol, compatible with any Wiegand 26-bit entry controller. The reader is fully encapsulated and can operate in extreme temperatures (-20°C to 50°C), allowing it to be installed in both indoor and outdoor environments. Built-in 2.4GHz Wi-Fi receiver for internet connection Communication between modules via Wiegand Compatible with the Izzy Access app (available for Android and iOS).