The listing is for Micron 32GB (2x16GB) 1Rx4 PC42666VRC111 ECC Server Memory modules packaged by HP. It is DDR4 RDIMM with a total capacity of 32GB spread across 2 modules, each with a capacity of 16GB. The memory modules feature ECC memory, which stands for Error Correction Code, ensuring reliable performance and error-free data processing. With a bus speed of PC4-21300 (DDR4-2666), this memory module is suitable for server environments that require high performance and data integrity.