* <s>Add buttons or mechanism to choose open duration time (The space is open for approximatly x hours), like 3 buttons (1h, 3h, 5h)</s>
* Picture of the perso who opened the door
* Android application using NFC in p2p mode, acting like a tag http://www.google.com/events/io/2011/sessions/how-to-nfc.html
= Pictures =