Relatives or friends need entry before you get there? No problem! Just open the door while in transit on the way home! Your phone can even tell you if and when your door lock has been tampered with in real time. With this service you don't have to keep a spare key under the mat.
Douglas Elliman Real Estate
M: (212) 300-3919
F: (917) 369-2690
325 Court Street, Brooklyn, NY 11231
There is a waiting list and I recently got invites to purchase one early, the video is pretty cool too.