SanDisk 256GB Ultra microSD UHS-I Card - A1 / UHS Class 1 / Class10, Up to 100 MB/s Read Speed, Up to 120MB/s Write Speed - SDSQUA4-256G-GN6FA at TigerDirect.com
Markings: speed, size and class | Understanding microSD and SD cards: speeds, markings and more | Adafruit Learning System