In the past few months, we have covered a bunch of interesting door locks for smartphones. RemoteLock 6i is a WiFi electronic door lock that allows users to manage doors remotely and monitor its usage. You receive alerts when your assigned codes are used.
This smart door lock could prove useful for Airbnb properties. It connects to your WiFi network to let you lock or unlock doors remotely. It offers lockout functionality after 5 incorrect attempts. You can find out more here.