The PNY Premier-X Class 10 U3 V30 microSD Flash Memory Cards are the perfect solution by which to expand on-board memory of mobile devices such as smartphones, tablets, action cameras, drones, and more, allowing users to free up space to enjoy more digital content. The Premier-X microSD Flash Memory Cards are rated Class 10, U3, V30, with read speeds of up to 100MB/s, guaranteeing that users can not only quickly and easily store and share content between devices, but also engage in HD photography and 4K Ultra HD Videography by leveraging the U3 technology. What’s more, the Premier-X microSD Flash Memory Cards feature V30 Video Speed Class, ideal for 4K Ultra HD video at 4096x3072 format, allowing users to capture high quality content on their mobile devices. Rated A1 (A2 for 512GB), the PNY Premier-X is optimized for app performance, allowing users to run apps directly from the microSD card, delivering faster app launch and performance than ever before.