Actual Items manufactor or Batch Number may vary Capacity:2GB;Speed: DDR2 533MHz (PC2-4200U)Number of Pins: 240 pinsType: ECC Memory Ram;Voltage: DDR2 1.8VPins of Memory RAMS: DDR for Desktop=184 pins;DDR for Laptop=200 pins;DDR2 for Desktop=240 pins;DDR2 for Laptop=200 pins;DDR3 for Desktop=240 pins;DDR3 for Laptop=204 pinsRead FirstThe Recognition of XP is around 3GBThe Recognition of Win 7 32Bit is around 2.26-4.5GBThe Recognition of Win 7 64Bit 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 1066MHZcolour: greenMaterial: PCBsize: 13.3x3cmPackage Contents: 1 * RAM Memory StickOnly 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.