SanDisk Extreme microSDXC V30 A1 U3 100MB/s 256GB is a great storage accessory built for professionals. Compatible for use with DSLR cameras, smartphones and tablets, it can record 4K Ultra HD and Full HD videos along offering tremendous read speeds of up to 100MB/s and write speed up to 90MB/s. Such great features help you shoot like a professional and get top-class responsiveness from your compatible device. UHS Speed Class 3 and UHS Video Speed Class 30 (V30) ratings ensure that you can watch high resolution videos on the go. This practically enables super fast transfer speeds. The accessory is also shockproof, waterproof, temperature proof and X-ray proof to protect all your memories and recorded work from any potential harm.