Important Facts to Consider: Electro-Mechanical Warning Siren. No speakers or amplifiers here, just real, honest, big-time, worry free sound. 100% Maintenance Free. Not just a part of the siren, the whole system !! NON-ROTATING. Forget about the worries of rotating sirens, this unit only has two moving parts !! Mechanically produced sound - stronger and further reaching than electronically produced sound. Proven, this siren has been deployed in cities around the world, and is the best selling single tone siren we offer. Lifetime Tech Support is included with every siren. No matter how old your siren is, we will help you through any problems. FIVE YEAR WARRANTY so you can rest assured your siren will be functional at all times. Employing carefully designed horns to project sound over long distances, the 7V8 is Sentry's newest model. The Model 7V8 is rated at 112 dB at 100 feet, and like all Sentry weather warning sirens, is OMNI-DIRECTIONAL. The 7V8 is available in single phase, three phase, or DC and is a single tone siren, producing 460 cycles per second., for optimal sound penetration. All exposed siren components are of metal construction, which are "Powder Coated" for the most durable finish available. The fan and housing are made of non-corrosive cast aluminum. Maximum diameter of the Model 7V8 shall be 56", maximum height of 41", and maximum mounting base of 19" square. Shipping weight of the siren alone is 300 lbs.