Hook up to an external speaker for an even more loud experience. Police sounds and sirens, DJ sounds and sirens, funny sounds and scary horns. Sounds include: - Police Sirens - Air Horns - Boat Horns - Truck Horns - Fire Sirens - Car Alarms - Reggae Horn - DJ Horn - and much more Horns and Sirens is a free ad supported app, so what are you waiting for, make some noise!