The Samsung 4GB 1Rx16 PC4-2400T-SC0-11 Laptop Memory is a DDR4 DRAM module with a total capacity of 4GB. It has a SO-DIMM form factor and features unbuffered, non ECC memory. This memory module is compatible with laptops that require a PC4-2400T bus speed and provides reliable performance for enhancing the overall speed and efficiency of the laptop's system.