With the more frequent use of smartphones and tablet PCs for multimedia recording and playback, there are increasing demands on the read and write speeds of dedicated memory cards. This Premier series memory card implements the latest SDA 3.0 specification UHS-I (Ultra High Speed 1, in compliance with SD 2.0 Class 10 speed), and comes with an entry-level price for consumers who want a dedicated card for their smartphone or tablet PC. Increased speed, no increase in cost Premier microSDHC/SDXC UHS-I U1memory cards have higher capacity, but without a higher price, and provide consumers with the faster read speeds of UHS-I U1 specification at the price of a Class 10 card. Sequential reads are up to 50 MB/second, and write speeds reach the UHS-I speed class 1 specification. Random read and write IOPS are 1400 and 100 respectively. They are remarkably suitable for users who enjoy high definition photography and video recording. Running multiple applications simultaneously causes no loss in read/write speed. * Data is based on internal tests. Test results will vary depending on different platforms and software. Durability These memory cards employ Error-Code Correction (ECC), and are extremely cold-resistant, heat-resistant and impervious to x-rays, making them one of the world's most rugged memory cards. Specifications: - Speed: UHS Speed Class1 / Speed Class10 - Random Read/Write: 1400/100IOPs - Dimensions (LxWxH): 15mm x 11mm x 1.0mm - Weight: Approx 0.25g - Operating voltage: 2.7~3.6Volt - Warranty: Lifetime warranty - Compatibility: Smartphones, tablet computers - Certifications: FCC, CE, BSMI, VCCI NOTE: Read/write speed based on ADATA internal testing; performance may be lower depending on host device..