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. Compatibility, this siren will integrate seamlessly with 99% of existing siren systems. 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.** DYNAMITE-lots of power in a smaller package. Great versatility too-whether you are supplying a large industry, small community, or filling "dead spots," the 107 dB rated 3V8 is the answer. The non-corrosive, cast aluminum fan is powered by a 5 Hp motor in your choice of single or three phase power, and produces a port tone frequency of 460 cycles per second. All exposed siren components are of zinc plated, steel construction, which are "Powder Coated" for the most durable finish available. The fan and housing are both made of non-corrosive cast aluminum. Maximum diameter of the Model 3V8 shall be 34", maximum height of 34", and maximum mounting base of 19" square. Shipping weight of the siren alone is 250 lbs.