The ADATA 4GB AM1L16BC4R1-B1GS PC3-12800S DDR3L 1600 CL-11 Laptop Memory is a used, single module of DDR3 SDRAM designed for laptops. With a capacity of 4GB and a bus speed of PC3-12800 (DDR3-1600), this memory module is made by ADATA in China. The SO-DIMM form factor and 204 pins make it compatible with a wide range of laptop models, offering reliable performance and capacity for upgrading or replacing existing memory modules.