The product is a Micron DDR4 16GB ECC RDIMM with a bus speed of PC4-21300 (DDR4-2666). It is a single module with a total capacity of 16GB. This memory module is designed for high performance and reliability in computer systems that require error correction. With its RDIMM form factor, this module is suitable for a wide range of computing applications, providing ample memory capacity for efficient processing and multitasking.