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 computer Hard 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: DDR3 Capacity: 4G Frequency: 1333MHz Working voltage: 1.35V colour: blue Material: PCB Size: Length: 13.3cm Package Contents: 1 x DDR3 PC Ram Memory Only 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. 4GB DDR3 PC Ram Memory Ram Memory DIMM Ram Memory