The Crucial Kit 4GB (4 Of Them) Laptop Memory is a set of two DDR3L SO-DIMM modules with a total capacity of 8GB. Each module has a capacity of 8GB, making it ideal for upgrading or replacing memory modules in laptops. The memory is non-ECC unbuffered and has a CAS latency of 13, ensuring reliable performance. With a lifetime manufacturer warranty and a low voltage of 1.35V, this memory kit offers a dependable and efficient solution for boosting your laptop's memory capacity.