Abstract: A container seal device is provided that comprises a seal device for a shipping container, comprising a first unit that is affixed to a shipping container. A control system is contained in the first unit containing a control system. A second unit is provided that is configured to engage with an element of a door of a shipping container to which the first unit is affixed and to electrically connect with the control system in the first unit. The control system in the first unit is configured to detect a breach of the second unit indicative of access being made to the shipping container.