Smart upgrades begin at home entrances. Locks controlled by apps can help users manage access rights of home visitors. Entry codes can be appointed to different family members or even be decided on a short-term basis for staff like pet sitters and cleaners. Likewise, locking systems send an alert when a guest comes, while an HD camera with microphone gives a live feed enabling hosts to connect with guests that are waiting, while being remotely present. Wi-Fi doorbells are innovative in terms of both security and power. People can even use the high-intensity stream for enhanced night vision views in the dark, and to protect their privacy by setting it in a silent mode to ensure no interruptions. This is especially useful when a baby is asleep or while one is taking Saturday afternoon nap. Marcus Hiles notes that even our beds are getting smarter: sleepers for newborns play music, shine comforting lights, and lightly rock babies with automatic settings; while adult mattresses track behavioral patterns and analyze numbers to improve sleep quality by controlling the position.