A few years back I was shoveling knee deep snow when I completely lost a white earbud. The app had a 'find my bud' feature, but when I activated it I couldn't hear anything. I pulled out the 2nd bud as a test, and it started chirping like a bird. Ironically, it was a beautiful day out so the sound just blended in with the other chirping birds all around. I ended up slapping my snow shovel on the ice a few times until one chirp remained!