Only works with Pebble. To install the pebble app, use this link, or the button on the screen in the app. http://apps.getpebble.com/en_US/application/55ec9a1ab3c9a0832a00005a
Just follow these steps:
1. Install this app
2. Launch this app
3. Click "Install Pebble Fart"
4. Select one of the farts on your pebble.
4* Bonus points, if you manage to start a fart by tilting your hand