Lockitron
Multiple models of Lockitron have been manufactured, including one that fits over the lock control mechanism on the inside of a door, and the door can then be unlocked via an app on the phone, or via web page control. Phones with Bluetooth Low Energy (4.0) can also automatically unlock a door when an authenticated device is nearby. A supplied NFC tag can be read to trigger a command to toggle the state of the lock. The original lock continues to work with traditional keys. When a traditional key is used, the device can send a notification to a smartphone.
Lockitron
Multiple models of Lockitron have been manufactured, including one that fits over the lock control mechanism on the inside of a door, and the door can then be unlocked via an app on the phone, or via web page control. Phones with Bluetooth Low Energy (4.0) can also automatically unlock a door when an authenticated device is nearby. A supplied NFC tag can be read to trigger a command to toggle the state of the lock. The original lock continues to work with traditional keys. When a traditional key is used, the device can send a notification to a smartphone.