The 64GB Gold Series UHS-I SDXC Memory Card from Panasonic is a UHS-I rated SDXC UHS Speed Class 3 memory card designed to support both 4K and 2K video recording as comes with a minimum write speed of 30MB/s when used with UHS Speed Class 3 host devices. When used with non-UHS Speed Class 3 host devices, this memory card offers minimum write speeds of up to 10MB/s. Along with the enhanced minimum write speed, you also benefit from a max read speed of 90MB/s and max write speed of 45MB/s. To protect your valuable data, this card is water, shock, x-ray, and magnet proof. It is also resistant to extremes in temperature, with a usable temperature range of -13 to 185°F (-25 to 85°C). Also, a built-in fuse protects the card and its contents from power surges.