The Samsung 4GB DDR4 2666MHz Laptop RAM SO-DIMM is a high-performance memory module designed for laptops. With a total capacity of 4GB and a bus speed of PC4-21300 (DDR4-2666), this module offers fast and efficient data processing. The SO-DIMM form factor makes it easy to install in laptops, and the DDR4 SDRAM type ensures reliable performance. The single 4GB module is ideal for upgrading or replacing existing memory modules in laptops for improved speed and multitasking capabilities.