No problem with the FS20 TS telephone remote control & the corresponding components of the FS20 radio remote switch system. Naturally, unauthorized triggering of switch commands is effectively protected by a secret code. All you need for operation is an analog telephone extension, a telephone system output or an analog ISDN system port. With the FS20 TS telephone radio remote control you can also retrieve a macro of your FHZ 1000 Radio Home Centre which means that you can access your home automation system directly.