What a neat item! Police light with electric horn/siren. Looks like a real thing! Four switches control 4-tone of police whistle. Another switch controls the flash modes of the police light. Light and control attach to handlebar with included hardware. Light approx. 5-1/4" x 3". Requires 2 AA batteries not included. Want to hear what the sirens sound like? Just copy and paste http://www.youtube.com/watch?v=-lhnhB4rbGw into your browser to check it out