Some Holiday Inn locations will soon begin using the OpenWays door system. This means that guests will be offered the option of having a unique melody sent to their smartphones and playing that to open doors instead of swiping keycards.
The OpenWays system is explained as being as secure as a traditional keycard system and sounds pretty simple to use:
The technology sends an encrypted, unique audio code to a guest's phone prior to check-in. When played back outside the guestroom, the signal unlocks the door, letting the guest skip the front desk-guests would also receive a text message with their room assignments-while also eliminating the need for keycards.
Picture by thenestor