Delivery guard door lock / Door lock

Existing parcel delivery service need receiver and deliverer to meet face to face
to identify person and check parcel. But as people can't be home everytime, so
face to face meeting is often unable. Delivery Guard Door Lock is rocker for this
problem. For the time receiver isn't home. Deliverer can recognize the parcel by
the bar cord in the Delivery Guard Door Lock. Then receiver, can confirm
parcel with cell phone , then by CCTV of Delivery Guard Door Lock can watch
parcel in real time.