A-Tech 1GB Stick for Panasonic ToughBook Series 29 (DDR2) 29 (DDR2) 73 (DDR2) 73 (DDR2) CF-18 Mk4 (CF-18J) CF-18 Mk4 (CF-18J) CF-18 Mk4 (CF-18K) CF-18 SO-DIMM DDR2 Non-ECC PC2-3200 400MHz RAM Memory