The SanDisk Extreme PRO 256GB microSDXC memory card is a high-performance and high-capacity memory card designed for use in various devices, including smartphones, tablets, action cameras, drones, and other devices that support microSDXC cards. Here are the key features of the SanDisk Extreme PRO 256GB microSDXC card:

• Storage capacity: The card has a generous storage capacity of 256GB, providing ample space to store a large amount of high-resolution photos, videos, and other files.
• Speed class: It is rated as UHS Speed Class 3 (U3) and Video Speed Class 30 (V30), indicating its capability to handle a minimum sustained write speed of 30MB/s. This speed rating makes it suitable for recording 4K UHD videos and capturing fast-action photos.
• UHS-I technology: The card supports UHS-I (Ultra High-Speed Phase I) technology, which enhances data transfer speeds for faster read and write operations.
• Read and write speed: SanDisk Extreme PRO microSDXC cards are known for their fast read and write speeds. The exact read and write speeds can vary based on the specific model and version, but they are generally designed to offer high performance.
• Extreme durability: SanDisk Extreme PRO cards are built to be durable and are designed to withstand water, shocks, extreme temperatures, and X-rays, making them suitable for various challenging environments and outdoor activities.
• A2 App Performance: Some versions of the SanDisk Extreme PRO microSDXC cards may be rated with an A2 App Performance Class. This indicates that the card is optimized for running apps directly from the microSD card, which can be beneficial for certain devices and applications.

These memory cards are ideal for professional photographers, videographers, and other power users who require high-speed, high-capacity, and reliable storage for their devices. However, it’s essential to verify the specific model and version to get the most accurate and up-to-date information about the SanDisk Extreme PRO 256GB microSDXC memory card, including its read and write speeds and additional features.