For parcel delivery service. Apply metal scanners check if an object is detected, the circuit consists of a metal or a signal will be sent in the form of sound or vibration.
For the parcel scanners detect metal surrounding the detected objects with metal. Panel or the circuit will send an alarm in the form of sound or vibration.
For the parcel. The scanner to check the surrounding metal case detected objects composed of metal. Or circuit board machine will alarm signal in the form of noise or vibration.