This 16GB 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.