I'll throw in my 2 cents.
There seems to be two headsets preferred in the marine market. One that has already been mentioned here is Eartec and the other Sena.
Eartec uses a radio frequency like cordless phones (remember those?), somewhere in the 1900 mhz range and is full duplex (both skipper and crew can talk at the same time.)
Sena uses bluetooth and can support up to 4 headsets and is also duplex.
After reading many reviews on both, I personally feel they are over rated, given their shortcomings. The Eartec product is heavy, bulky, has a short battery life (5 to 10 minutes some claim), easy to slip off your head when reaching over the side for fenders, etc. The Eartec has a master and slave configuration. The Sena product has a flimsy neck band to be worn under a motorcycle half helmet. The main complaint is that the neck band breaks easily and bluetooth is not as reliable as RF. Neither are waterproof, Sena has one that is "water resistant" however.
After considerable hand ringing, I ended up buying "Referee Headsets" on Amazon, 2 for just over $100.
https://www.amazon.com/gp/product/B083W7CZYY/ref=ppx_yo_dt_b_asin_title_o08_s00?ie=UTF8&psc=1
WE LOVE THEM! I know, I know, I know...There are going to be skeptics out there. You're asking, how can they be so good and be so cheap?
Well, first of all, the battery life is extremely long. My wife has not charged her headset in several days after multiple uses and she still comes in loud and clear. When they do require a charge, it takes about 15 minutes. They are very lightweight. I can barely tell it's on my head. In part that is because the receiver/sending unit is worn on the belt or on your arm. The headset is plugged into the receiver sender unit. It is full duplex without master/slave configuration. They are waterproof! It is highly unlikely they will slip off your head. After all, referees run with them and the battery lasts a full game with reliability. Both the headset and receiver weigh a fraction of one Eartec headset and take up very little precious space in your boat. The sound quality is clear as a bell and we have tested them at the marina with about 1000 ft of distance...still clear as a bell. Wile we have not found a use for pairing with our phones, that is a feature also. They are full duplex with up to 4 users.
I'm sold and I recommend to all shipmates! ...no need to spend a lot of money on Eartec or Sena, especially given their weaknesses.