Pack of 25 MLC Industrial Grade MicroSDHC Card Speeds: Up to 80MB/s Read 50MB/ Write High Endurance: Up to 384 Terabytes Written Water proof, shock and vibration proof, X-ray proof, magnet proof, impact proof Operating voltage: 2.7V to 3.6V / Operating Temp Range: -25°C to 85°C and -40°C to 85°C Memory management FW features power immunity, auto/manual read refresh, ECC, wear leveling. Advanced features such as health status meter, programmable ID, host lock (card ownership lock), secure FFU and dynamic bit flip protection.