Securing cargo / shipping containers used for storage and workshops with electronic security systems is tricky. This is because such a container is essentially a 'Faraday Cage'. This means that radio signals cannot penetrate the metal skin. The Mobeye Container Alarm provides a nice solution to this problem by equiping the device with an external 'mushroom' antenna on 2.5 meters of cable. Simply mount the detector inside the container, drill a small hole in the roof (3mm), thread the antenna through the hole and connect to Mobeye unit. The 'mushroom' antenna is designed to fit flush the the metal of the container to prevent water ingress and to be virtually undetectable to intruders.