An SD card is a type of memory card that is often visually referred to as an external memory card.
SD memory card is a new generation memory device based on semiconductor flash memory. It is widely used in portable devices due to its small size, fast data transmission speed, hot swappable, etc., such as digital cameras. Personal digital assistant (foreign language abbreviation PDA) and multimedia player.
They have worked perfectly when I gave them tests couple days ago,they are very fast and the price is very good,For other brands maybe you just can get one spend this money,but for this one,you spend the same money can get two SD cards,valuable!