This Bosch Boxed Siren Strobe Combination Unit is a weather-resistant siren system that is designed to provide a loud and effective warning signal. The unit includes a white box style cover, selectable 12V DC siren or 8 ohm horn, LED strobe and tamper switch. The siren is designed to be used in either indoor or outdoor applications and can be used for both residential and commercial applications. The siren produces an audible signal of up to 115dB, which is loud enough to be heard from a distance. The LED strobe is designed to produce a bright and visible signal, which can be seen even in the dark. The tamper switch is designed to detect if the siren has been tampered with and will trigger an alarm if it has. The unit is easy to install and can be connected to most alarm systems. This siren is a great choice for providing an effective warning signal.