OK, I broke down and got the Scuba Tector. Been sitting here reading on how to operate it. It has two buttons and apparently a tilt switch that it uses for switching all the various modes. It's a little more complex that I had considered. Hopefully get a chance to dive with it in the near future.
If anyone does get one of these, READ THE INSTRUCTIONS THOROUGHLY! It fires up in minimum sensitivity for pin pointing and will need to have settings changed before using as a detector. It's not a difficult machine, it's just not a turn on and go detector except as a pin-pointer. At least this is my initial assessment after playing with it while sitting in my easy chair and reading the instructions.