A few years ago I bought one of those GE key chain buzzers from Animal Works. The battery did not last long because I set it off while the rocket was on the pad. When I was at NSL 2018 I met a young rocketeer that had the same buzzer. She had it rigged to her shock cord in such a way that it would go off upon ejection. I should have taken pictures.
I recently got one from Home Depot. I have tried to duplicate her setup but no luck. I'm wondering if anyone has ever done this? Has anyone ever used some other buzzer or audio device to find rockets? I tried the original Tile but it was a failure when I tested it at a RIMRA launch. Tile now has a new version in which you can replace the battery.