Patent ID: 7782200

Claim:
A reusable electronic seal for a trailer which comprises: a structural enclosure configured to attach onto a shackle of a padlock, wherein said structural enclosure further comprising an outwardly extending arm for interfacing with the padlock, and said structural outwardly extending arm further having a shackle aperture therethrough configured to receive a pivotal leg of the padlock shackle to lock the seal onto the padlock an electronic module integrated within the enclosure, said module comprising; a rechargeable battery producing an electrical power source, a battery charging circuit in communication with said battery, a photovoltaic cell in communication with said battery charging circuit providing a power source for recharging the battery, a voltage sensor interfacing with said battery indicating battery voltage, a microprocessor programmed with software to receive a battery voltage signal from the voltage sensor and if low voltage is sensed by the microprocessor the microprocessor sends a signal to the battery charging circuit to recharge the battery, wherein said microprocessor receiving electrical power from said battery, a random number generator interfacing with said microprocessor, a liquid crystal display communicating with said random number generator, and a shackle engagement switch configured to engage the padlock shackle, applying a signal to said microprocessor such that when the padlock has been opened and re-latched the shackle engagement switch signals the microprocessor to signal the random number generator to send a new number to the liquid crystal display.