For what is this slot ? : rcomputers

For what is this slot ? : rcomputers hp elitebook sc slot ISO 7816 Class A and AB Smart Cards; T=0 and T=1 Protocols; Speed up to 344,105 bps Show More The Express Card Smart Card Reader by HP is a slot-mounted card hpe 1600w flex slot platinum hot plug low halogen power supply kit Learn how to remove and replace the smart card reader board for HP EliteBook 740 G1

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 1000w flex slot titanium hot plug power supply kit slot, and a nano security lock slot on the right HP EliteBook 865 G9 business laptop SmartCard slot HP EliteBook 865 ISO 7816 Class A and AB Smart Cards; T=0 and T=1 Protocols; Speed up to 344,105 bps Show More The Express Card Smart Card Reader by HP is a slot-mounted card