Caught this nice red 10V earlier today in Wilkinson, IN. As with any Sentry, it was potent and loud. This siren had been having non-performance altering run capacitor issues, which can be seen in Calvin Mayer's video, but it has since been fixed. Enjoy!
My video:
https://www.youtube.com/watch?v=ZXBa9SoeWbI
Michael's video:
https://www.youtube.com/watch?v=Dqg6qxgOX4M