1GB STICK For Toshiba Toshiba Satellite M55-S135 M55-S1351 M55-S1352 M55-S2252 M55-S2253 M55-S321 M55-S325 M55-S3251 M55-S3262 M55-S329 M55-S3291 M55-S3292 M55-S3293 M55-S3294 M55-S331 M55-S3311 M55-S3313 M55-S3314 M55-S3315 M55-S351 M55-S3511 M55-S3512 M55-SP325 M55-SP3252 M55-SP329 M55-SP339 M55-SP341 M55-SP361 P10 P10 Small Business P10-05E P10-133 P10-154 P10-204 P10-221 P10-231. SO-DIMM DDR NON-ECC PC2700 333MHz RAM Memory. Genuine A-Tech Brand. 1GB STICK SO-DIMM DDR NON-ECC PC2700 333MHz RAM Memory Genuine A-Tech Memory Lifetime Warranty Toll Free Technical Support 1-866-557-4527 Designed For Toshiba Toshiba Satellite. (See Compatibility List Below)