it looks like it's a remote button that you can configure and attach to your clothes, then you can tap it and something on your phone happens (like play next song)
All in all, as someone who might want to use this product one day, I'd rather Google not spend their project's resources on never-buyers like yourself and instead spend those adding features and driving cost down for people that could be genuinely interested.
Sure. And drop all open protocols and support only the proprietary ones while they're at it?