From Manufacturer
This 32GB SDHC Memory Card Class 4 from SanDisk is a highly secure stamp-sized flash memory card, which can be used in a variety of digital products including digital music players, cellular phones, handheld PCs, digital cameras, digital video camcorders, smart phones, car navigation systems and electronic books, that conform to the SD 2.00 specification (rated Class 4 for speed and performance). The SDHC Card features a 15MB/s write speed and also contains a security feature for the protection of copyrighted data.
SDHC Compatibility Information
Because SDHC cards work differently than Standard SD cards, this card format is not backwards compatible with legacy SD format host devices. Please check your device (camera, PDA, MP3 player, etc.) for compatibility with SDHC cards