Allison Finch
Contributor
Unfortunately, clickers need air to operate effectively. I've tried several designs with poor results. I like the Hammerhead which is made by the same people who make the dive alert.It attaches and operates the same way as the dive alert. It is designed to operate underwater and offers a gentle, long distance beep that is really effective. I spot for underwater photographers and they really appreciate the signal when I've found good stuff.