Ketofa 5 Tone Siren and Microphone for Motorcycle Car Van Truck 5 Sound Loud Horn 12v 60W Speaker provides very loudly sound, about 300 decibels unit at full volume 5 Siren sounds: Hooter/Ambulance/Traffic/Police/Fire alarm speaker 18cm long and 11cm height Microphone for PA system 12 Volt DC powered