Reddit reviews BoTian Micro USB OTG and Charging hub for Windows Tablet simultaneous Charging and Data transmisson 。Micro USB OTG hub for Android Tablet and Smart Phone Single Data Transmission。

[ONLY OTG--NO external power] This product is a 4-port USB OTG hub。When it is not connected to an external power supply , it can be used for all tablets and smart phone with OTG function, realize independent OTG function. You can use it to connect your USB disk, USB keyboard, USB mouse and USB mobile hard disk to your tablet and smart phone for data sharing and keyboard and mouse operations.[OTG AND CHARGING--Connect external power ]This product can support Simultaneous data Transmisson and charging for all windows systems tablet with OTG function when the external power supply is connected。Whether it's playing HD movies for a long time, copying files or surfing the Internet，You don't need to worry about your tablet Power off。( tablet and smartphone operating systems other than Windows do not support simultaneous data transfer and charging)[System compatibility ] This product is equipped with an automatic terminal optimization circuit, no switching is required.When connected to an external power source, only win10 / Win8 / win7 operating system is supported。When external power is not connected, win10 / Win8 / win7 / Android are supported。[Practical] The outer casing of this product is made of PC material, which has high flame retardancy, small size, beautiful appearance and easy to carry. It saves you work space and can be easily placed anywhere. It is a good companion for tablets 。[Standard configuration] This product comes standard with USB TO MICRO (2-core) big-current charging cable, which can better and faster replenish power for tablets ，Make your tablet more stable。