The CyberPower Magnetic Door Sensor Switch helps you monitor Carbon Rack Enclosure door access and notifies users when a door has been opened or closed. It features a 10' cable and requires a CyberPower RMCARD205 or RMCARD305 network interface card and ENVIROSENSOR (all sold separately). The CyberPower Magnetic Door Sensor Switch is also compatible with third-party contact closure monitoring systems.