The other day I parked at work, up on the 3rd floor of the garage. Sat in the drivers seat and got my bt earbuds connected, hit play on Spotify, then locked up the tracker and started walking to my office. Got down to ground level and started walking away and audio started breaking up. Got annoyed and took phone out to see what's up. Oh wait phone is in tracker. Didn't break up until there were 3 floors of concrete/steel/cars between us.