Which headphones are best for hearing the outside world?

Question

Headphones

No, I didn’t confuse anything) I need headphones in which the outside world is clearly audible, so that they hide noises / sounds as little as possible.
As an option, perhaps it makes more sense to take a small portable speaker with a good battery capacity for 5-6 hours, are there any?
I work alone, it's boring. But it is necessary to hear the approaching transport, I work at the post (on the street) there are no sockets nearby. It is clear that the music itself will muffle the surrounding sounds, just vacuum headphones or closed-type external sounds harass.

Answer 1

There are some bone conduction headphones. The ears are not covered at all. But I haven't personally tried it.