For more information videos and installation guides on the dsc alexor alarm system click herefor the alexor brand store the dsc alexor internal wireless siren connects to your alarm system and ensures that should the alarm activate or give a conformation tone you will increase the internal noise level this is also a good addition to your system if you would like to disguise the location of the alexor central control panel as the siren will be emitted from this as well as the panel siren