It has Apple’s U1 ultra-wideband chip integrated to authenticate you and unlock the door hands-free, so all that you have to do is open the door when you get home. . 99 $229. 99) at Amazon. You’ll just need a Thread border router (recent Apple TV models, the second-gen HomePod, and the HomePod Mini are just a few examples of border routers at varying prices) to let your devices communicate over Thread instead of purely over Wi-Fi, saving the doorbell’s battery along the way.