Each memory through the various types of manual testing, make the product can used in different application environments,be able to provide users with both high-performance and high stability of the computer experience.Whether it is universal user, gamers, or computer enthusiasts, can feel memory bring the performance improvement for computerHard disk/flash memory vendors are using decimal arithmetic: 1MB=1000KB, 1G=1000MB calculated, but the operating system is using binary arithmetic: 1MB=1024KB, 1GB=1024MB.So there are some differences between display capacity and nominal capacity of hard disk/flash memory products. However, this is allowed to exist. Please do not doubt his authenticity.Type: DDR3Capacity: 4GFrequency: 1333MHzWorking voltage: 1.35Vcolour: blueMaterial: PCBSize: Length: 13.3cmPackage Contents:2 x DDR3 PC Ram MemoryOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.