PITTSBURGH -- After comments on a popular comedy show about police tactics used in Pittsburgh during the G-20 summit, a special ringtone is now available on the Internet.

Comedian Jon Stewart joked about protesters using the sound produced by the L-RAD sonic cannon as their ringtone.

Pittsburgh police used the cannon to get the attention of protesters, and now a local Web site offers the sound as a ringtone for your cell phone.

Locallytoned.com offers the piercing noise for download.

Movie producer Carl Cimini captured the sound from footage she shot for a documentary on the G-20 summit.

"It's something a little more serious," said Cimini.

Locally Toned developer Teresa Foley asked him for the ringtone for his Web site that promotes homegrown sounds for ringtones.