Nest Hub Gen 2 Vs Gen 1. Gen 2 are ga01xxx or ga02xxx depending on color. Audio is projected loudly and clearly. You weren't expecting a device now entering middle age (by smart home standards, at least) to oust the latest and greatest, were you? There is a model number on the side of the box. Whereas the old model was a little indistinct, the new hub has cleaner, clearer audio. Available soon for $99, the new google nest hub uses radar to detect how well you’re sleeping. In fact, it's good enough to listen to the occasional bit .