Technological advancement in access control of buildings especially the hotel industry have enabled the use of mobile phones to open and close doors.
Once a guest checks in at the hotel reception , he is given a toll free number to call when near his hotel room.
Once he calls the number close to the hotel room door, the door lock is designed to respond to the sound emmited from the mobile phone and opens to grant the phone owner access into the room.
https://www.youtube.com/watch?v=4yXd3wS3Acg
The hotel IT department will be able to keep changing the sounds used to open the door locks as the guests keep changing.
To prevent chances of burglers recording the phone sound then gaining unlawful entry, the phone sounds keep changing severally after a few minutes after being used to open the door. The sound is also securely encrypted.
This technology will also be explored upon for use at the proposed a4architect hotel along the Southern Bypass, Nairobi.
https://www.a4architect.com/discus/topic/joint-investment/page/4/
Francis Gichuhi Kamau, Architect.
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