Universal Card Reader Mobile phone PC card reader Micro USB OTG Card Reader OTG TF / SD flash memory small form factor, easy to carry. USB A male with a micro USB dual- plug design , Smart Phone and PC support dual interface . without data via PC, smartphone and memory card bidirectional transmission . fully compliant with high-speed USB2.0 transfer protocol , the maximum transmission up to 480Mb / s.Supports SD v3.0 UHS-I specification , the maximum transfer 104MB per second. plug and play, no external power supply. supports high-speed large -capacity SDXC, micro SDXC memory card, up to 128GB.