Review on YHAAVALE 9200E Amplifier Emergency Police Siren & Ultra Slim Metal Octagon Compact Flat Speaker, DC12V 100W Multi-Tones Wired Control with Mic Loudspeaker Electronic PA System for Police Vehicles by Brian Olson

Loud and compact enough to fit on my RZR. Running requires a horn/siren. This system is as loud as full size rigs. The microphone function is very quiet and not possible for a loud broadcast as stated in other reviews, but I do not use the microphone for my purposes. Annual update: siren and everything still works great despite high vibration and constantly wet and muddy conditions. .Two years and three months update: This system is still running like new despite all the abuse and the horrific conditions it has been subjected to. It's hard to believe that something so affordable has lasted so long.