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Currently there are two types of popular advanced door locks, the first one uses Bluetooth while the second model is using NFC. Both are promising but to use it your phone must be turned on.

So the question is, How you can open the door if your phone battery phone is low or completely had no power???

CalypsoKey is the answer, this door lock system uses RFID technology so it does not need batteries or particular application installed on your mobile phone.

Introducing CalypsoKey
CalypsoKey consists of a door lock system and iPhone case that have RFID technology. To open the doo, you just need to put your phone close enough to the door handle and the door will be unlocked automatically.

Source: Calypso Crystal






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