Fortrezz SSA2USR Siren Strobe Alarm Wireless Z-wave Red Lense BEFORE YOU BUY: Check to make sure your home automation controller / security panel is interoperable with our device. NOT ALL Z-wave Controllers are compatible. Please visit our website, ask your controller manufacturer, or call us with questions. Requires Z-wave Gateway for control (purchased separately) Indoor Use Only - 110 dB Sounder, Super Bright LED's Backup 9V battery included w/ tamper resistance. Siren will sound if power wire is interrupted. 3 modes to choose from: Siren ONLY, Strobe ONLY, and Strobe & Siren