Designed for microSD devices such as smartphones, drones, and action cameras that can capture Full HD and 4K video, as well as raw and burst photography, the 128GB Extreme UHS-I microSDXC Memory Card from SanDisk has a capacity of 128GB, is compatible with the UHS-I bus, and features a speed class rating of V30, which guarantees minimum write speeds of 30 MB/s. If your device does not support the V30 standard, this card also supports the U3 standard, which also guarantees minimum write speeds of 30 MB/s. Read speeds are supported up to 245 MB/s, and write speeds max out at 120 MB/s.Aside from support for UHS-I, V30, and U3, SanDisk also built this card with support for the Application Performance Class 2 (A2) spec, which includes optimizations to give Android users an improved mobile experience, delivering faster mobile app performance. The A2 spec allows the card to manage random read input-output access per second (IOPS) operations so it can quickly open apps and process accompanying tasks, such as audio, graphics, saved profiles, and in-app permissions.As with most SanDisk media, this memory card is shockproof, x-ray proof, and waterproof, while also being able to withstand temperature extremes. Additionally, SanDisk's Memory Zone app offers users a simple way to organize, browse, and back up files on their Android mobile device.Capture Larger Than Life with 5K and 4K UHDUnlock startling 5K point-of-view, soaring 4K UHD aerial video, and pristine high-res stills with video speed class ratings of U3 and V30. Capture flawless frame-by-frame precision in continuous burst mode and freeze fleeting instances in slow-motion Full HD to unleash your creative potential.Speed Barriers Shattered, AgainSave precious moments with blazing read speeds up to 245 MB/s and write speeds up to 120 MB/s. Stay in the flow with quicker transfers and minimal downtime.Maximize with Massive CapacityRecord longer and store more on your Android device, laptop, or handheld gaming console with up to 128GB of storage.Durability You Can Count OnEngineered to perform with unrelenting resilience in extreme conditions, SanDisk microSD cards are temperature-, humidity-, water-, shock-, drop-, magnet-, X-ray-, and wear-out proof.SanDisk Memory Zone App for Easy Content ManagementEasily back up, organize, and transfer your photos and videos with the SanDisk Memory Zone desktop or Android mobile app. Whether you use the microSD card slot on your phone or a card reader, the SanDisk app helps to simplify your content management in one place.Built to Last and LastBacked by a lifetime limited warranty, SanDisk cards perform over the long haul. Their in-house NAND flash memory manufacturing and proprietary flash management techniques deliver rock-solid stability, and rigorous testing helps ensure flawless performance with compatible devices.