Your mobile phone is your key !
check this out, in Sweden your i-phone is your key to your hotel door ! how long before we all have them on residential doors
To the future - from Assa-abloy
http://www.youtube.com/watch?v=hNhleCZkpqI&feature=pyv&ad=10929439651&kw=door%20lock
To the future - from Assa-abloy
http://www.youtube.com/watch?v=hNhleCZkpqI&feature=pyv&ad=10929439651&kw=door%20lock