As a parent of a high functioning ASD child -- consider adding a way to attach that to clothing (or a way to attach a generic tether, which could then be used to attached to a belt or a necklace, etc) and you have a whole new market.

[edited] I know you market yourself as tetherless, but I'm referring to something as simple (and optional) as the mechanism Roku does for their wrist straps on remotes (and Nintendo Wii, etc):

https://twitter.com/rokuplayer/status/524376205345435648