UCEC Micro USB OTG Adapter - A Female to Micro - Micro Female Charging for Hard Disk This USB Host adapter allows you to connect a USB memory stick, an USB 2.0 memory card reader, or a keyboard to your Tablet & Cell Phone. (some standard USB 2.0 devices need to connect the extral usb power cable if they consume too much power) Connect to a keyboard for easier control of your Tablet & Cell Phone. The extral USB Cable is the Power for USB Device(Like usb hard disk, flash disk), Can not charge the Tablet & Cell Phone. Compatible with Samsung Galaxy S3 i9300 S4 i9500 Note2 N7100 Note3 N9000 & S5 i9600 and All Micro USB OTG function tablet/phone