GENESIS LED G4SE SERIES STROBE EXAPANDERS has both Mass Notification/Emergency Communication and Life Safety System notification capabilities. They have ultra-low current draw to reduce power requirements and a low-profile design that allows the installation of two independent strobes and a speaker or horn in a single compact assembly. Adjustable settings that remain visible standard too. Fits standard 4" square electrical boxes. Indoor/wall mount applications only. White with "ALERT" marking. UL listed.