The Lexar High-Performance 633x 128GB MicroSDXC UHS-I Memory Card is made for sports camcorders, tablets, smartphones, and any other microSD-compatible devices. It can be used to record Full HD, 3D, and 4K video. This card has a 128GB storage capacity, is UHS-I bus compliant, and has speed class ratings of U3 and V30, which both offer minimum write rates of 45 MB/s. This card also supports Class 10, V30, and U3 standards, all of which have minimum write rates of 45 MB/s, in case your device does not support the UHS-I bus. The Lexar 128GB Memory Card has a maximum read speed of 100 MB/s and can hold up to 36 hours of video, 67,600 pictures, or 58,100 music. The memory card can be used in card readers or other devices with full-sized SD slots thanks to the included microSD to SD converter.