AC220V VHF signals superimposed on the power line to devices that clings to release locked the door by remote control from a remote

摘要

present invention is to apartments, the building 's roof doors and fire doors normally locked the adjuster has a guard or control room , etc. the device allows to remotely open . ; more specifically, can be locked and open when needed Nor nest VHF signals clings to AC220V power lines seen so far and can be designed by a remote control .