Features: The USB interface can connect USB devices such as U disk, mouse and keyboard. Built-in power conversion circuit, when connected to an external power supply, you can cut off the power supply from the host to the HUB to save power. When a mobile phone or tablet with a MICRO USB interface is in OTG mode, it can only read the data of the USB device and cannot charge at the same for time. This is due to the limitation that the MCIRO USB interface has only 5 wires. When the power consumption of external USB devices is relatively large (such as mobile hard disks, game controllers, etc.), you can connect an external power source through the MICRO USB interface to achieve simultaneous operation of multiple high-power USB devices. Note that the power supply is not charging. If you connect multiple devices at the same for time or connect to devices with high power consumption such as mobile hard disks,It requires an external power supply line to assist in power supply. Therefore, the direction of power supply here is to supply power to external devices, not to charge mobile phones. Specifications: Material:ABS Length:Approx.19cm/7.48in Net Weight:15g Note: Please allow 1mm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x Micro USB OTG 2 in 1 Cable