ALC Wireless AHSS51 Indoor Siren will scare off intruders with this extremely loud 105db audio alarm and flashing Red LED light. The Indoor Siren works with other parts of the system and the Control Hub to trigger when there is a breach to a window, door or motion detector while system is armed. alcwirelessahs612 Works with AHS612, AHS613, AHS616, AHS627-23