Actual Items manufactor or Batch Number Full Tested.Becompatiblee Shipping Model: DDR2 SODIMM Capacity: 4GB Frequency: 800Mhz Function: DDR2 200PIN Scope of application: laptop Pins of Memory DDR compatible Desktop=184 pins DDR compatible Laptop=200 pins DDR2 compatible Desktop=240 pins DDR2 compatible Laptop=200 pins DDR3 compatible Desktop=240 pins DDR3 compatible Laptop=204 pins Read First The Recognition of XP is around 3GB The Recognition of Win 7 32Bit is around 2.26-4.5GB The Recognition of Win 7 32Bit is around 8-16GB Becompatiblee purchasing , please confirm which model is suitable compatible your Laptop, usual models are as bellow: PC2 4200 = DDR2 533MHZ PC2 5300 = DDR2 667MHZ (Compatible with DDR2 533MHZ) PC2 6400 = DDR2 800MHZ (Compatible with DDR2 667MHZ, DDR2 533MHZ) PC2 8500 = DDR2 1066MHZ The appearance and color of different batches of products may be different, which not affect the use Colour:green Material: PCB Size:7 x 3cm Package Contents: 1 x RAM Only the above package content, other products are not included. Note: Light reflection 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.