The Samsung 4GB DDR4 2133 MHz PC4-17000 1Rx8 Laptop RAM Module is a high-quality memory module designed for laptops. With a total capacity of 4GB and a single module, this DDR4 SODIMM module features a bus speed of PC4-17000 (DDR4-2133) and 260 pins. Manufactured in China by Samsung, this RAM module is ideal for upgrading or replacing existing memory modules in laptops to improve performance and multitasking capabilities. Tested working!