Ultra Stable Laptop Memory from Corsair - the Leader in Performance Memory Solutions * Designed for current generation notebooks, mini-PCs and netbooks * Microsoft® Windows® Vista? and Windows® 7 operating systems * Single 4GB DDR3 Laptop Memory Module - 1333MHz Unbuffered CL 9 SODIMM Memory 9-9-9-24 1.5V * Lifetime Warranty * Microsoft Windows Vista and Windows 7 operating systems