Capacity:4GBSpeed: DDR2 800MHz (PC2 6400)Number of Pins: 240 pinsType: Memory RamVoltage: DDR2 1.8VDual Channel:SupportPins of Memory RAMSDDR2 for Desktop=240 pinsRead FirstThe Recognition of XP is around 3GBThe Recognition of Win 7 32Bit is around 2.26-4.5GBThe Recognition of Win 7 32Bit is around 8-16GBBefore purchasing rams, please confirm which model is suitable for your Desktop/Laptop, usual models are as bellow:PC2 4200 = DDR2 533MHZPC2 5300 = DDR2 667MHZ (Compatible with DDR2 533MHZ)PC2 6400 = DDR2 800MHZ (Compatible with DDR2 667MHZ, DDR2 533MHZ)PC2 8500 = DDR2 1066MHZDifferent batches of products are slightly different. The color is random, the specified color is not accepted, and it will not affect the useLength: 13.3CMMaterial:PCBcolour:greenPackage Contents:1 * DDR2 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.