Police Lights Circuit using 555 Timer and 4017 Decade Counter
ronfrtek's public projects - Arduino Project Hub
How to Make a Siren Using Arduino
Arduino Police Siren With LED Police Lights - Tutorial - Hackster.io
Make a Mini LED Siren (powered by Arduino!) : 6 Steps (with Pictures) - Instructables
Police Lights and Siren using Arduino by Manmohan Pal - YouTube
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
Ambulance & Police Siren Generation Using Arduino or Analog Circuit
Police Siren & Lights for your Arduino car - Hackster.io