Koolertron CAR Amplifier Alarm 12v Pa Speaker System Mic 5 Sound New 12 Volt powered. Speaker is 18cm long and 11cm height 60W Speaker provides very loudly sound,it is about 300 decibels unit at full volume. 5 Siren sounds: Hooter/Ambulance/Traffic/police/Fire alarm Microphone for PA system. This 12 volt siren work as a PA system including microphone and has 5 siren sounds.