Setting Up an Outdoor Siren

From X10Wiki

Questions

Can I hook up an outdoor siren to my security system?

Answer

The PH508 Powerhorn or SH10A Small Powerhorn is a remote siren that trips a few seconds after the console. It can be plugged into an outlet anywhere in the home (at the other end of the house or in an attic, for example). It is not intended for outdoor use but can still function if it is protected by a weather-proof enclosure. It is not possible to trigger a third party siren from the PS561 base console, because any module that might be used to control it (Universal Module or Appliance Module) does not respond to the All Lights On command transmitted during an alarm. However, the DC8700 Monitored Security System can be setup to transmit a specific code (rather than All Lights On) when it trips. It can therefore turn on an X10 Module that could be used to activate a third party outdoor siren.

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If you have active home pro you could setup a macro set off a third party siren with a universal module.