512MB KIT (2 x 256MB) For HP-Compaq Color LaserJet Series 4650 5550 5550dn 5550dtn 5550hdn 5550n. SO-DIMM DDR NON-ECC PC2700 333MHz RAM Memory. Genuine A-Tech Brand.<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>512MB KIT (2 x 256MB) SO-DIMM DDR NON-ECC PC2700 333MHz RAM Memory</li><li>Genuine A-Tech Memory</li><li>Lifetime Warranty</li><li>Toll Free Technical Support 1-866-557-4527</li><li>Designed For HP-Compaq Color LaserJet Series. (See Compatibility List Below)</li></ul></div><img src="http://ecx.images-amazon.com/images/I/61c1Ic3oyiL.jpg" noproxy>