A free app for Android, by Infinite Lab.

Do you dream of being a real policeman?  If the answer is yes, then you should try this app. The Wireless police Children app will allow you to be a real police officer.  With the help of the application, your smartphone will turn into a police realm. Play with your friends in police and bandits. Save the hostages, arrange chases, play spies or secret agents.  

This is very simple to use. Just download the app and you can now hear siren sounds, radio, police car sounds, and police game with police special operations sounds. radio. It is very interesting and entertaining and most especially, it is free.