Ideal for Android Smartphones and Tablets. Certified to work with Chromebooks. (This product has been certified to meet Googles compatibility standards. Chromebook and the Works with Chromebook badge are trademarks of Google LLC.). Compatibility: Compatible with microSDHC and microSDXC supporting host devices. Up to 140MB/s Sequential read performance and up to 150MB/s speeds2 Transfer speeds (Based on internal testing; Performance may be lower depending on host device, interface, usage conditions, and other factors.) lets you move up to 1000 photos in a minute (Based on 4.1GB transfer of photos (Average file 3.5MB) with USB 3.0 reader. Results may vary based on host device, file attributes, and other factors.).