Lexar 128GB microSDXC UHS-I 633X High-Performance Memory Card & USB 3.0 Reader 2-Pack Premium memory solution for sports camcorders, tablets, and smartphones Quickly captures, plays back, and transfers media files, including 4K, 1080p full-HD and 3D video Performance of U1 and U3 version is exactly the same More than 8 times quicker transfer times with included USB 3.0 Compatible with both PC and Mac systems