It's an Airzound Airhorn. I've been using one for over 20 years. THey were originally plastic bottles, my newest is a metal cannister, but it looks like they may have gone back to plastic. The metal cannister works better below 25F.

BTW...the same thing happened to me the next day while I was driving.

Also, I guess I didn't explain that the brand of spoke-lights is "Monkey Lights" from Monkey Electric.

And now that I think about it, it would be great if Monkey Electric came out with a device that throws poop. Most bike days are uneventful, but every once in a while...