A:Answer THERES IS UHS I AND UHS II THESE REFERS TO THE CARD READER ON THE DEVICE AND WILL DENOTE THE SPEED OF THAT CARD READER ASLO REFERED TO AS THE BUS AND THE TYPE OF BUS, UHS II BEING THE NEW VERSION AND CAPABLE OF HIGHER SPEEDS, UHS I WILL HAVE ONE SET OF CONTACTS AND UHS II 2 SETS OF CONTACTS,
NOW THE NUMBER YOU ARE LOOKING AT THE 3 REFERS TO THE UHS CLASS ALSO DENOTED A 1 OR 3 U1 OR U3 ,,,,U3 BEING THE FASTER YOU CAN GET A UHS I U3 CARD OR A, UHS I U1 CARD THE U1 OR U3 REFERING TO THE SPEED OF THE CARD AND THERE ARE UHSII CARDS WITCH WILL HAVE 2 SETS OF CONTACTS THE UHS I CARDS WILL HAVE 1 SET OF CONTACTS
