To provide an inexpensive and easily attached device for preventing electric power from being consumed wastefully in such a condition as a luminaire is left not to be turned off, without requiring the luminaire to be moved by a user, in the existing suspension type luminaire.

In this receptacle, a remote controller having a connector with a control function for ON, OFF and time-range assigned OFF, and a function capable of transmitting commands for the ON, OFF and time-range assigned OFF is set to provide the inexpensive device allowed to be attached by the user to the existing suspension type luminaire as an intermediate connector.