2GB P5300 200PIN SODIMM 667MHZ DDR2 SDRAM. 

LIFETIME WARRANTY FOR EXCHANGE. by Computer Memory Solutions

Brand Computer Memory Solutions

GUARANTEED TO WORK IN YOUR COMPUTER OR YOU GET YOUR MONEY BACK. 

WE DON'T USE OEM OR GENERIC BRANDS TO AVOID INCOMPATIBILITY.

COMPATIBLE WITH:Panasonic Toughbook 51 Core Duo CF51RCLDFBM, CF51RC4EFBM

Maximum Memory: 4 GB
Expansion: 2 Sockets