Global Entry cards have radio frequency identification chips, which enable their use at Secure Electronic Network for Travelers Rapid Inspection (SENTRI) and NEXUS travel lanes when entering the United States at the land borders. You must follow all program rules for SENTRI when using this card at the Southern land border ports of entry.
https://www.cbp.gov/travel/trusted-traveler-programs/global-entry/card
Interesting thing to note:
Global Entry cards have radio frequency identification chips, which enable their use at Secure Electronic Network for Travelers Rapid Inspection (SENTRI) and NEXUS travel lanes when entering the United States at the land borders. You must follow all program rules for SENTRI when using this card at the Southern land border ports of entry.