Micron 4GB 2 x 2GB PC3-8500S DDR3 1066 Laptop Notebook Memory Kit Lenovo 55Y3713 Manufacturer: Micron Model: MT16JSF25664HZ-1G1F1 Memory Type: DDR3 SODIMM Capacity: 4GB 2 x 2GB Bus Type: PC-8500 1066Mhz