Convenience begins right at the front door. App-controlled door locks let users decide how they want to allow access to their homes and to whom: entry codes can be preset for friends or family members, and even issued on a temporary basis for visiting workers like plumbers and cleaning people. Many smart locks send a mobile alert when a guest has arrived, while an HD camera with microphone provides a live feed of the entrance area, allowing hosts to communicate with waiting company, even when not home to receive them. Wi-Fi doorbells are a game changer for both safety and power: residents can even utilize the high-definition camera for night vision during darker hours, and can protect their privacy by engaging a quiet mode when wishing to remain undisturbed. The latter function is particularly convenient for keeping a resting infant happy or preserving a weekend nap. Marcus Hiles notes that even our beds are smarter these days: sleepers for newborns can play music, shine soothing lights, or lightly rock babies with automated settings; and adult mattresses track behavior patterns, analyze the data, then improve sleep quality by adjusting the position.