Pretty much the same thing happened to me, except I’m not an audio engineer and the only equipment I had was my ears. I stood in one spot moving my head (which helps pinpoint sound) until I heard the beep and then moved in that direction. It took about 5 beeps (upstairs, end of hallway, kid’s bedroom, far side of room, bingo). I found our battery starved CO2 detector behind a dresser where it had fallen with a couple of shirts and got hung up on the chair rail. I felt like a superhero with the powers of an owl.
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