The SK Hynix 4GB 1Rx8 PC3L-12800S-11-13-B4 RAM is a DDR3 SDRAM memory module with a total capacity of 4GB. It is designed in a SO-DIMM form factor and operates at a bus speed of PC3-12800 (DDR3-1600). This memory module is suitable for use in computers and laptops to enhance their performance and increase the amount of available memory for various tasks. With the reliability and quality of the SK Hynix brand, this RAM is a dependable choice for upgrading your system.