The microSDXC (SD eXtended Capacity) memory card is designed to handle large volumes of data at high speeds. microSDXC is high capacity portable storage ideal for use in a tablet or camcorder with microSDXC expansion slot.microSDXC cards are able to handle significantly greater amounts of information due to two advances in technology. The exFAT file system enables the microSDXC card to handle large volumes of data while the UHS-1 interface can transfer videos and picture files with speeds of up to 104MB/sec**microSDXC UHS-1 (Ultra High Speed Bus 1) memory cards can achieve the highest speeds only when paired with a UHS-1 device. For devices without the UHS-1 interface the guaranteed minimum data transfer rate for Class 10 will be 10MB/Sec.Verbatim microSDXC memory cards can only be used on microSDXC host products featuring the latest SDXC technology. PC or laptop users need to download an SDXC compatible driver for the SD slot from the Microsoft Download Centre. Compatible with Windows XP SP2 onwards and Windows Vista SP1 onwards.Speed class designates the minimum writing performance to record video. E.g Class 10 = 10MB/sec.UHS speed class is designed for UHS products only.