The 4GB DDR3 memory make everything on your computer faster-- load applications faster and run demanding programs without lag. Energy Efficient 1.2V lower voltage modules which can reduce power consumption by up to 40%, increase energy efficiency and extend battery life ensures a green and reliable operation. High Density DDR3 is twice as much memory as you could install in a DDR2 system, hit up to 4GB and kits up to 8GB increasing your laptop's multitasking capabilities. Improved Bandwidth DDR3 SODIMMs increase memory bandwidth by over 30%, allowing your system to handle more data at once. Easy Installation Install the memory just a few minutes, high quality chips with strict testing for long lifespan. Specification: Brand: Form factor: SODIMM Total capacity: 4GB, 1.2V Bandwidth: pc3-DIMM type: Unbuffered Number of item: 1 Item weight: 0.3 Package size: 0.39in Package weight: 0.5