This is very loud hooter for your bicycle. Consists of a bottle that you put in your bottle holder and a horn with a ring that fits to your handlebars.

The horn has a button on the top. Press it to hoot.

If you lift up the button, there's a standard bicycle valve where you pump up the bottle with a bicycle pump.

The bottle has a removable velcro sleeve that allows it to be stuck to any velcro strip, thus saving your bottle holder for it's intended purpose.

Reply to this if interested.

Price? Brand & Model? Photo?

Price: This forum is called "Free Stuff".
Brand and Model: No idea. Does it matter?
Photo: I posted photos. No idea why the are not showing. Will try again.

Retry, the photos are not loading for some reason.

Sorry, I didn't think to check the thread location to discover that it was free. Given that it's free, then you are right, the make and model is not so important. Thanks for getting the pics to now work.