I got my final tour email with hotels and was surprised by one of the comments. Be sure to bring wired earphones. The only thing I could find was from several years ago, that they're needed for a communication system the guides sometimes use. Is this still the reason.?
These were not on the general packing list when I booked the tour. We recently upgraded phones and tossed a pair of wired earphones... since nothing I own has a jack anymore.