Invisa's Non-Contact Security Sensor for Exhibit and Display Applications (ES-3) uses the proven InvisaShield® presence sensing technology in a device that is easy to set up and works reliably over time. The ES-3 can be directly coupled to a non-grounded conductive object to be protected, such as a metal cabinet, plate or safe. The object then becomes an antenna that emits a low-energy sensing field. Non-conductive objects can be protected by placing a metal plate, foil or wire adjacent to or in contact with the object to be protected. In either case, if the field around the object is violated, an alarm is triggered.