Agree with @tomfcrist. Donate it to a local high school for use at their sporting events.
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I've got a dive buddy who uses a dive alert attached to his inflator hose. Sounds like a duck under the water and I pretty much always know it's him if I hear it.
If I was you I would get an air horn and greet him with it first thing at 6am on dive trips for using that damn quacker. For extra bonus points, place some legos right next to his bed near his feet.