The Genuine Samsung 4GB 1Rx8 PC3L-12800S Laptop Memory Ram M471B5173DB0-YK0 is a high-quality memory module designed for laptops. Made by Samsung, this DDR3L RAM has a total capacity of 4GB, split into one module of 4GB capacity each. It has a bus speed of PC3-12800 (DDR3-1600) and is designed in a SO-DIMM form factor, making it compatible with a wide range of laptop models. This memory module is a reliable and efficient choice for upgrading or replacing existing RAM modules in laptops.