The SDSQXCZ-400G-GN6MA is a robust 400GB microSDXC (TransFlash) card from WD/SanDisk Retail, falling into the Extreme Pro series, renowned for their top-tier performance and reliability. It is specifically tailored for professional use, offering an impressive Video Speed Class 30 (V30) and UHS Speed Class 3 (U3), enabling users to record and playback stunning 4K UHD videos without any hitches. Boasting an A2 rating, it ensures high application performance for faster app loading and execution on mobile devices, which is paramount for intensive applications and games. The card achieves remarkable read speeds of up to 170MB/s, facilitating swift file transfers and efficient workflow management. Like its family members, it's built to withstand extreme conditions, being water-resistant, shockproof, temperature-proof, and x-ray proof, guaranteeing the safety and integrity of your files, regardless of where your profession or adventure takes you.