ESA500 - An access control device from effeff For quick and easy access control Stand-Alone device from effeff The access control device ESA500 fits all existing DIN mortise locks for wood, steel, PVC and metal doors. The outside handle of the device is monitored and the inside handle is always activated. The ESA500 works with a "Plug-and-play" system, one user code is programmed. A big advantage: The PIN codes in the memory can be erased individually. For more technical information about the ESA500 click here.