Micro USB + 2-in-1 USB 2.0 Micro SD TF Card Reader with OTG for PC and Phone #1 Compact design, easy to carry for on the go use. USB2.0 Interface. No external power supply required. Supports memory cards:T-Flash/Micro SD. Supported Device: All OTG-Enabled Phone and PC. Size:3.5cm x 1.5cm x 0.8cm-1.38inch x 0.59inch x 0.31inch.