Trigger Sound Alarm
You can trigger an alarm by pushing a button on the App.
There's a siren sound that can scare people and make them run away 
https://learncctv.com/
Note :
"Trigger Sound Alarm"This content is uploaded by APPS CONNECT Developer and available on Google Play Store. APPS CONNECT Developer do not own this content and this content credits to their respective owners listed in the source link. Hopefully useful and please share this app.