For what is this slot ? : rcomputers

NEW Original For HP EliteBook 840 850 G5 G6 Smart Card Reader hp elitebook sc slot Inserting a SIM card of the wrong size could damage the SIM card or cause the SIM card to become stuck in the slot Smart card reader Supports optional hp elitebook sc slot Predám notebook HP EliteBook 840 G5 s výkonným CPU Intel Core i7-8650u procesor Intel Core i7-8650U 2GHz, RAM: DDR4 8GB + voľný slot

hp omen m 2 slot I can conveniently insert my credit card into the SC slot on my HP EliteBook 840 laptop How can I utilize this when running Windows 10?