The Axiom 4GB DDR3L-1600 SO-DIMM RAM is a single module with a total capacity of 4GB, suitable for upgrading or replacing existing memory modules in laptops and other small form factor computers. The DDR3 SDRAM type ensures reliable performance, while the 204 pins make it compatible with a wide range of devices. With a bus speed of PC3L-12800 (DDR3-1600), this RAM provides fast data transfer speeds to enhance the overall performance of your system. The compact SO-DIMM form factor makes it easy to install and use in various devices.