Important Facts to Consider: Electro-Mechanical Warning Siren. No speakers or amplifiers here, just real, honest, big-time, worry free sound. 100% Maintenance Free Siren: Just take care of the batteries, and that's it !!! NON-ROTATING. Forget about the worries of rotating sirens, this unit only has three 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, large scale siren we have. 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.*** Rated at 125 dB at 100 feet, the Model 16V1T-B is an OMNI-DIRECTIONAL siren which produces continuous 360º coverage, making it the clear winner over rotating sirens. Get ready for power!! The 16V1T-B is the largest battery powered siren available today. It is a dual tone siren, employing two rotors with different numbers of ports to produce a greater range of frequency. The Model 16V1T-B is a single tone siren, with both rotors producing 460 cycles per second for the ultimate in penetration capability. All exposed siren components are of Electro-Plated, Galvanized Steel 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 16V1T-B shall be 78", maximum height of 65", and maximum mounting base of 19" square. Shipping weight of the siren alone is 600 lbs.