Keystron 256MB DDR2 144pin 16-bit Memory Upgrade for Brother Laser Printer HL-5470DW, HL-6180DW, HL-6180DWT One (1) 256MB DDR2 144pin 16-bit memory upgrade Part#: HL533/256 100% compatible with lifetime replacement warranty Manufactured by Keystron, LLC Keystron is a registered trademark of Keystron, LLC