what is the slot labled SC above the HD on my Latitude E6420

HP EliteBook 840 G1 Notebook PC hp elitebook sc slot I just bought a used laptop and on the side is a slot I never seen before Google revealed it to be a smart card reader, yet I cannot really hpe 1600w flex slot platinum hot plug low halogen power supply kit 50657 - HP NB HP ELITEBOOK 840 G11 970V6ET Ultra 5-125H 14 16GB SSD512GB Finger Print SC Reader Wolf Sec W11P*Garanzia 2 anni OnSite NBD*

hpe 500w flex slot platinum hot plug low halogen power supply kit HP EliteBook 840 G7 14, Intel Core i7-10710U, 16 GB, 512 GB, CH Frage Auf der Seite hat es einen SC Slot