All Plugzio devices are constantly monitoring the status of electricity flow. If your charger is unplugged during an active session the Plugzio will automatically end the session and the user is only billed for what they have used. This is indicated by the LED transitioning from rainbow to a breathing pattern as seen in the video below.
Once the session is ended:
If Single-User Auto-Start is enabled, users can then just plug in to start another session.
If Single-User Auto-Start is not enabled, Plugzio will immediately shut off the flow of electricity. Users will have to then authenticate and activate the device to start a session.
Read more on Single-User Auto-Start here.