Step into a new stage of storage with the Samsung PRO Ultimate MicroSD. It supports every ambition from creative pursuits to professional projects and personal memories with high speed and the compatibility to keep you on top of your game. *The foregoing read and write speeds are based on tests conducted under controlled conditions. Actual speeds may vary depending upon card capacity. Stated performance was achieved by using PRO Ultimate microSD cards with Samsung readers. UHS Speed Class 3 designates a performance option designed to support 4K UHD video recording with enabled UHS host devices. UHS Video Speed Class 30 (V30), sustained video capture rate of 30MB/s, designates a performance option designed to support real-time video recording with UHS enabled host devices. See www.sdcard.org/consumers/speed. A2 performance is 4000 read IOPS, 2000 write IOPS. **Host device compatibility may vary. ***Waterproof: withstand up to 72 hours in seawater. ****Temperature proof: operating temperatures of -13oF to 185oF; non-operating temperatures of -40oF to 185oF. *****Wearout: up to 10,000 swipes. ******XRay Proof: up to 100mGy, equal to airport X-ray machines. *******Magnetic-Proof up to 15,000 gauss, or the magnetic field equivalent of a high-field MRI. ********Drop: withstand drops up to 16.4 feet (5 meters). *********Proofs are for the microSD card and do not include the adapter. Samsung is not liable for any damages and/or loss of data or expenses incurred from memory card data recovery.