This is My adaption of a mini air raid/tornado siren based on the Thunder bolt model of sirens produced in the cold war,

you will need a 775 DC motor which can be found here, along with the included screws. 775 DC Motor DC 12V 7500-15000RPM & Bracket High Speed Large Torque Low Noise Gear Motor Electronic Component Motor Perfect for DIY Electric Power Tools - Amazon.com

You will also need 2 skateboard ball bearings which friction fit into the top and bottom of the Rotor cage. the rest of the body is held together with 3d printed pins; you can probably figure out how to put it together.  I would highly recommend ear protection when running it at even at half volume. anyways Have Fun!

Hear is a video of it working: (6) My mini Thunder Bolt siren. (Files available!) - YouTube

and hear are the raw CAD files if you want to modify my original design: [https://drive.google.com/drive/folders/1rWce7C-JI3bawD3EnQzKoPl8v5_BYMCf?usp=drive_link](https://drive.google.com/drive/folders/1rWce7C-JI3bawD3EnQzKoPl8v5_BYMCf?usp=drive_link)