If you press the unlock button to open the latch, its LED flashes several times without controlling the latch, the security lock mode is active on the Classe 300 EOS, so the keys are only active if there is an audio/video connection between the internal unit and the external video unit. To deactivate the security lock mode: - remove the Classe 300 EOS from the wall bracket - remove the green power terminal - move the security function lock to the back of the internal unit - reinsert the green power terminal - reposition the internal video unit on the wall bracket This operation must be carried out by an authorized person.