SUPER SIREN ELECTRIC 3-SOUND HORN BICYCLE ALARM. THE SUPER SIREN ALARM IS A 3 WAY, IT HAS AMBULANCE, FIRE ENGINE, AND POLICE THAT WORKS, COMES COMPLETE WITH PARTS AND CLAMP TO FIT MOST BICYCLE HANDLE BAR STEM BOLT. IT USES BATTERIES AND IT HAVE ON/OFF SWITCHES AND A PLACE TO HANG UP THE MIC, GREAT FUN FOR KIDS WITH SAFETY NOTICES AND FUN FOR SOME OF US BIKE KIDS TO. USES ONE 9V BATTERY (NOT INCLUDED).