Monitron LCT-SS ground intrusion detection system. This is part of a ground sensor system. It includes what is shown in the photos. The weatherproof case, sensor circuitry and radio, antenna, and desiccant pack. There are additional components required to operate including, six volt batteries, sensor probes either seismic or magnetic, and receiver. I have approximately 40 of these including the receiving equipment and paper printer. These are commonly used for perimeter site and border security. I recently inherited these and have no use for them. Thank you for looking.