The SK Hynix 4GB DDR4 2666MHz PC4-21300 SODIMM Laptop RAM is a high-quality memory module designed for laptops. With a total capacity of 4GB and a bus speed of PC4-21300 (DDR4-2666), this RAM offers fast and efficient performance. It is a single module with 260 pins and is manufactured in China. Additionally, it features ECC memory, ensuring reliable data transfer and error correction. The product comes with a lifetime manufacturer warranty, making it a dependable choice for improving the performance of your computer.