I am glad to hear of other options - I push a manual wheelchair so having a clunky thing on my wrist would be really annoying (and could even hurt if it got stuck in the spokes). But I will just attach it with a carabiner to my belt loop, like I do my keys. That way I can show it to them easily but not have a really annoying thing on my arm.
Also, are they all one size, are there children's sizes, etc? I have tiny arms (as do many others) and having something that can slip off would stink - I imagine them flying above people's heads in Tower of Terror!