Well, this card is pretty cool. I received one that says C10 instead of U1 (like this picture).  For what I use it, U1 won't work, so the one I received is C10.  I needed mine for a iON Air Pro camera, and the advertisements that &#34;supposedly&#34; say class10 on the page description, but it says U1 on the card won't work for the camera.I don't know why they don't call it Ultra 1 instead of falsely advertising it as a C10 when it really is a U1.  I was lucky to receive a C10, so it worked out, but it makes it more confusing for the other laymen.