To facilitate the selection of a place for the installation of a receiver by mounting a command-signal receiving section, a reception control section and a means notifying and outputting a signal of a reference level or more in an electric shutter to the receiver and confirming non-defective or defective radio environment.

A signal from a transmitter 8 is received by an antenna 10a, and an output from a reception control section 11 is output to a driving control section 6. An open-close machine 2 is operated by a control command in response to an input in the driving control section 6, and the opening and closing of a shutter curtain 1 are controlled. A monitor lamp is set up to a receiver 10, and the reception control section 11 and the monitor lamp are connected. When the signal from the transmitter 8 is input, the monitor lamp is set so as to be lit for a fixed time, and whether or not the signal from the transmitter 8 is received can be visually observed directly from an operator operating the transmitter 8 and the installation operator of the shutter curtain 1.