Features:The sound compounded by the digital programs and measure up to the requirements of police and fire control department.Works with ANY 12V Car, Van or Truck60W Speaker provides very loudly sound.It is about 300 decibels unit at full volume.5 Siren Sounds??oHooter/Ambulance/Traffic/Police/Fire Alarm4-Hole Mounting BaseEasy to InstallConnect the red wire to the postive pole and the black wire to the negative pole.Specifications:Voltage: DC 12VOutput Power:60WTone:300dBMaterial:ABS PlasticColor:BlackSize:17.5 x 15 x 11 cmWeight:662gPackage:1 x Car Loud Horn1 x 5-Sound Siren MicrophoneSome Mounting Brackets and Screws