Mainly for swimmers, good price and less-frequently discounted. Comes with a decent set of ear and nose plugs which actually create a clearer sound underwater with the OpenSwim headset. These have just recently come back into stock after a few months of unavailability.
Also features an EQ toggle to switch between open-air listening and under-water listening, the bass is stripped back to accomodate the added natural bass from the seal when underwater or using earplugs.
Note for audiobook/podcast listeners, this is MP3 only, no bluetooth connectivity, there is also no fast-forward or re-tracing function so you have to skip a whole track forward or backward which is good for songs, but less so for audiobook chapters.
Not sure of expiry date sorry.
Good for open sea with Jaws theme