This topic is so we can discuss mini sirens us enthusiasts that have no room or money for a real siren have made. Description and pictures are required, but you can also add what it's based off of and the story of it's life.
I've made one and constantly upgraded it, the most notable change being the change from rotational to omnidirectional, then to add paper plates with the middles cut out, covered in Duct tape to act as louvers. It's about 15 inches tall, and 9 inches across. This makes it a 1/2 scale Fedelcode Model 2.
The siren is very portable, and weighs maybe a pound or so. It runs on an MP3 player to provide all the tones, and music when I want to use it as a stereo system (which works very well)
I will get pictures in about 20 minutes.