Probably not as high tech as you are looking for but we bought one of those button combo electronic locks and we are pretty happy with it:
http://www.amazon.com/Schlage-BE365VCAM619-Camelot-Keypad-Deadbolt/dp/B000NJJ1MQ/ref=sr_1_1?ie=UTF8&qid=1446314220&sr=8-1&keywords=electronic+deadbolt
I was looking at the android powered lock (the above lock cost less so we went with it)... there is some paranoia floating around about hacking into you lock not sure if that is justified or not.
YMMV