Babbler is a sensor that seals containers with a digital encryption, it logs temperature inside containers and enables tracking and tracing of containers. The sensor allows advance warning to the shipper if a seal was tripped, so that they can warn customs. The babbler seal generates encrypted passcodes, which cannot be predicted without the digital key. An inspector must show the passcode to prove he has inspected the seal. Additionally the temperature of the cargo is logged and can be read wirelessly from outside the container. This allows early warning if the temperature has been incorrect for any period of time. Furthermore the babbler sensor can easily identify your containers and shipments. The sensor devices wirelessly advertise the container number and shipment number enabling a smooth tracking and tracing.