Upgrade your system's memory with this Crucial 4GB DDR3L-1066 SO-DIMM RAM module. Designed for Mac systems, this single module with a capacity of 4GB ensures efficient performance and smooth multitasking. The bus speed of PC3-8500 (DDR3-1066) further enhances the speed of your system. This memory module is ideal for those who want to boost their system's performance without compromising on quality. The SO-DIMM form factor makes it easy to install, and the DDR3L technology ensures lower power consumption. With this Crucial DDR3L-1066 RAM module, you can enjoy faster and more efficient computing without worrying about the condition of the item.