Headphones - Blue-tooth or Not?

The buses tours may or may not have converted to blue-tooth. I would bring cable and perhaps a plug adapter. Most of the plugs I have seen are a RCA, mini, stereo plug. But you are never sure.

If the tour provider is providing the 'whispers', probably best to have wired headphones/earbuds.

If you are listening to your own device, suit yourself

Thanks such much for responses! Last minute worry. These thoughts helped.

I’ve switched to blue tooth just to lose the annoying, dangling wire. If a tour uses the whisper system, they’ll also supply earbuds for them and you can use those if you rent audio guides in a museum.