oh... hmm, must have been mid-late 80s I read those things.
I keep finding other series I read though, but not that one. Maybe I've got it wrong, maybe it wasn't a wristwatch.. but that's what I remember, they had like digital watches they could talk into and that could, I dunno, control electronic devices or something. Shoot lasers? I'm just guessing at this point
I think the only real scene I remember is a pub that had a shark aquarium..
I must have read those books a dozen times each yet I can't remember more... damn alzheimers