I bought two of these Memory Cards for use with my Logitech Alert 750e Outdoor Master Security Camera's. So far, I have found them to be unreliable. I am not entirely certain if this is because of the Camera system or the Memory Card themselves. The camera frequently will report a memory card error that indicates the card has to be reformatted. This is problematic as if the camera had recorded something that was important, the failure of the SD card would be very troublesome indeed.