Performance Grade 64GB Kyocera DuraForce XD SmartPhone MicroSDXC Card by MIXZA is Pro-Speed, Heat & Cold Resistant, and built for Lifetime of Constant Use! (UHS-I/3.0/Up to 750x) Get Ultimate Quality and Speed for your Kyocera DuraForce XD! The best quality, speed, and control really makes a difference! Most receive longer battery life, faster pictures and video abilities, plus more! SPECIFICATIONS: UHS-1, Class 10, 500x-750x Read Speeds, 15-20MB/s Minimum Read speed and 9.5-15MB/s Write Speeds. *BUY NOW - NEWEST VERSION NOW AVAILABLE!*