Its using a pretty intense servo. They have a wooden version of the deadbolt to servo device too. It uses a raspberry pi for the controller. I wonder why not a RPi Zero instead. The comm’s is blynk between the phone and RPi.
https://hackaday.io/project/19478-smartphone-connected-home-door-lock
Oh found the instructables article for it too
http://www.instructables.com/id/Raspberry-Pi-Smart-Phone-Connected-Door-Lock/?ALLSTEPS