Perfect for the latest high-megapixel cameras and HD camcorders that support the SDXC format: SanDisk Ultra SDXC flash memory cards deliver great , "don't miss a shot" performance for taking photos, and fast downloads between your PC and card, reducing wait time. The cards feature a Class 4 rating to ensure smooth HD video capture and playback and fast transfer speeds of up to 15MB/s/1.Features:Twice the capacity of existing 32GB SDHC productsGreat for HD video recordingFast transfer performance up to 15 MB/sReliability with a Lifetime limited warrantyHigh capacity : 64GBHigh transfer speed upto 15 MB/sPLEASE NOTE - If an SDXC memory card is inserted into a PC or a host product that does not support SDXC memory cards, a message may prompt you to format the card. Do not format the SDXC memory card in a non-compatible host product; it will erase the data on the SDXC memory card and format the card for a different file system that will no longer work with SDXC host products.