The unit is a loop powered addressable magnetic door holder. It does not require external supply as it is directly powered by the loop. The activation of the unit is achieved using cause and effect programming as used for I/O units.

If the power is removed or the communication with the panel is lost, the unit will automatically release after approximately 30 seconds. A built-in loop isolator is provided. When a short condition exists on either side of the loop connections, a Yellow LED will be turned ON. Its operation will be reset after the fault condition is removed.