Panasonic R4 /W4/T4 /Y4 is incompatible. CANNOT be recognized
vv Anti-static bag to protect from oxidation and ESD (electrical static discharge) damage vv
vv Integrated package in BOX to protect from physical damage during shipping vv
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↓Panasonic R7, 3G RAM upgrade example↓

↓Panasonic Y7, 3G RAM upgrade 2G RAM upgrade example↓
vv Good Quality. Burning-test pass for one week by memtest86, RST and Microsoft Windows Memory Diagnostic vv

　

(2GB RAM) MicroDIMM 172PIN DDR2-533 PC2-4200 533MHz 1X2G PANASONIC FUJITSU US
vv Please check with your laptop for compatibility list on the bottom before place a offer vv

vv Our product is excellent and stable. Our Buyers in Japan and their rating response append below as reference. vv