Key Features Resistant to dust, hail and rain drops (IP54). Operates at a temperature of -25°?. Indicates armed/disarmed mode with a built-in LED. Operates up to 5 years without battery replacement or from 12 V DC power supply. Principle of operation The device notifies of detector activation with an audible alarm and LED. Sound level and alarm length are set in the mobile application. Installation Street Siren is ready to operate straight out the box: the battery is already installed, therefore there is no need to disassemble the siren. With one click, it can be connected to the hub in the mobile application.