The e-tags can be mounted either after stuffing is complete or upon arrival to the port of load. In either case, a PC, PDA, or handheld terminal (like a Teklogix Workabout Pro) is used to load shipment information and “lock” the e-tag. The loading device can also provide the GPS location of the lock event. Once locked, the e-tag will report its information and event log whenever it is in proximity of an e-tag reader .