The product is a set of two 16GB DDR4 2666MHz laptop RAM modules by SK Hynix and Ramaxel. The modules are in the SODIMM form factor, with a total capacity of 16GB split into two 8GB modules. The RAM is DDR4 SDRAM, with a bus speed of PC4-21300 (DDR4-2666). This RAM upgrade is suitable for improving the performance of laptops requiring DDR4 memory modules.