Dual Micro USB Host OTG Hub Adapter Cable For Cellphone Samsung Galaxy S3 S4 Google Nexus Cable end A:Micro USB male connector for smartphone Cable end B:2 USB 2.0 OTG ports for external device connection+ Micro USB port for power supply USB 2.0 port support USB devices such as USB flash, card reader,USB mouse, USB keyboard,USB gamepad etc,they can work simultaneously (can't connect hard disk) Micro USB port can connect the original charger to provide the power for the abovementioned USB devices Support USB 2.0,compatible with USB 1.1