The case with a micro USB 3.0 port, can be used as a card reader for reading TF / CF / SD card. The case with a micro USB 3.0 port, can be used as a card reader for reading TF / CF / SD card. Notes 1. The Memory cards reader function supports computers and the devices with OTG function, but the iOS apple iPhones are not included. 2. Before you start to read the card, please double check your device s setting and make sure the OTG function is on. Q&A 1. Q: Can it read SDXC card? - A: Yes. 2. Q: CF and SD card (or MicroSD) can t be read at the same time, when the second card accesses, the first card can t work. - A: No, it can t read two cards or more at the same time. Feature 1,Material: made of environmental protection ABS polycarbonate material without smell, anti-aging as well as not easy to deformation. 2, Waterproof:The shell of inside card case is TPV material, the seal performance is good, which can prevent the water or the debris from entering. When it rains outdoors, the memory cards in the card case can be effectively protected. 3, Anti-shock: From the general height or even higher fall down, it also will not affect the memory cards in the card case, memory cards inside are still firmly embedded in the rubber, really achieving the impact of anti-fall shockproof 4, Flame-retardant: With the general fire machine to burn the card case, no fire or deformation phenomenon, the material completely reaches the environmental protection of flame-retardant standards. High capacity: 3CF + 7SD + 12TF or MSD+ 1CARD PIN.