We have designed microCARD M400/M40A class 4 bearing in mind mobile devices. That is why they are an ideal solution for mobile phones, navigations or music players. Fast reading and writing speeds and our lifetime guarantee speak undeniably in favour of GOODRAM microCARDS. You can also use GOODRAM microCARD as a standalone item as well as convert it into classic SD card thanks to high quality adapter!CompatibilityBecause SDHC works differently than standard SD cards, this new format is NOT backwards compatible. To ensure compatibility, look for the SDHC logo on cards and host services (cameras, videocamers, etc.).Lifetime warrantyProduction of GOODRAM memory cards involves only the best components and very strict quality control. Thanks to the above, alike other GOODRAM brand products, GOODRAM memory cards are covered by lifetime warranty of the producer.