Capacity: 2GB. Brand new, not refurbished, not opened, not used. High technology and brand product. Form Factor 240-pin. Memory technology DDR2 667 SDRAM. Manufacturer Part Number KTH-XW4200AN/1G. Voltage:1.8V. Will Work in any Desktop PC Requiring DDR2 667 (PC2 5300), DDR2 533 (PC2 4200) or DDR2 400 (PC2 3200) Memory.  Compatible with DELL Dimension E521 E520 C521 9200 & XPS 210 410 700 710 models & more. Kingston Lifetime Warranty. Manufacturer Website Address Kingston. Number of Modules 1 x 2GB. Memory Speed 533MHz DDR2-667/PC2-5300.