Eartec Simultalk 24G Full-Duplex Wireless Intercom with Slimline Headsets
At first we thought these were perfect. We could hear each other very clearly. But the moment I started to tie and move lines on the boat while docking, I couldn't keep them on my head. The headset kept slipping off and so I had to hold it on my head.  I finally had to take it off because I couldn't work lines with only one free hand.  Very frustrating.