Corsair Apple Certified 4GB (1x4GB) DDR3 1333 MHz (PC3 10666) Laptop Memory 1.5V<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Capacity: 1 x 4GB</li><li>Speed: 1333MHz CL9</li><li>Timing: 9-9-9-24 (1333 MHz)</li><li>Pin Out: 204 Pin</li><li>Voltage: 1.5V</li><li>Latency: CAS 9</li><li>Tested at Apples compatibility lab to ensure functionality with all current DDR3 based Macbook Pro， iMac， and Macbooks</li><li>Lifetime Warranty</li></ul></div><img src="http://ecx.images-amazon.com/images/I/51KHgRI2hUL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41%2BKkhIFQeL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51uL2xbwe7L.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51x9ReNX4IL.jpg" noproxy>