I would buy the Tap if it was always on listening while on the cradle but then push button while portable. Doesn't look like it works that way from the descript

I would buy the Tap if it was always on listening while on the cradle but then push button while portable. Doesn't look like it works that way from the description. I get that it takes too much battery to have 7 always listening microphones on, but while on the cradle, this should be a non-issue.