These cards are capable of recording hours of HD video (720p) and completely compatible with mobile phones, notebook computers, tablets and other devices that support the micro SD format. This versatile micro SD Card comes with an SD Card adapter for compatibility with SD-enabled devices, such as cameras, camcorders and notebook computers. Water-proof, temperature proof, X-ray proof, shock proof Sandisk Ultra 8 GB Secure Digital High Capacity (SDHC) - 1 Card SDSDU-008G-A11 Flash Memory
These were much cheaper because they are immitation. They look almost identical, but you can tell when you put them next to a real SanDisk Ultra SD Card that it is not the same. They are missing the SanDisk emblem on the back of the card, and it is slightly thicker plastic.