5 Simple Siren Circuits you can Build at Home | Homemade Circuit Projects
Amazon.com: Police Siren for Diecast and R/C Emergency Vehicles - 4 Real Sounds from an in-Service Police Cruiser - Runs on 9 Volt Battery : Arts, Crafts & Sewing
How to make Police Lights by using Arduino | LED Chaser - YouTube
Making a siren using Arduino – Microcontroller Based Projects
Police Siren with LED Police light | Arduino Police Siren - YouTube
Fun Programming with Arduino: Flashing Lights and Siren - YouTube