The Ramaxel 4GB 2Rx8 PC4-2666V-UC0-11 Laptop RAM is a high-quality memory module designed for laptops. With a total capacity of 4GB and a form factor of SO-DIMM, this DDR4 SDRAM module offers fast performance and reliable memory features. The module has a lifetime manufacturer warranty and features ECC memory for error correction. Compatible with PC4-21300 (DDR4-2666) bus speed, this unit is a dependable choice for upgrading your laptop's memory capacity.