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 general 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. Specification:Type: DDR3Capacity: 4GFrequency: 1600MHzWorking voltage: 1.35VMemory Channel: Dual ChannelPins:240pinsUnbuffered, Non-ECC, & Non-RegisteredColour: blueMaterial: PCBSize: 13.3x3cm Package Contents:1 * DDR3 4GB Desktop Memory Ram Only the above package content, other products are not included.Note: Light shooting 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.