I’m considering adding this little piece to the foam container.

It’s an entry-level soldering project I put together 2-3 months ago and I might buy and assemble another one for $10-12. Including the 9v battery, it only adds 70 grams.

http://www.velleman.eu/products/view/?id=339222

It’s possible that if we land in a tree or thick wooded area, an audible cue might help with locating the payload.

Yes, it’s annoying. That’s kind of the point.