The NANAMI Multi-Function USB Cable is the ultimate cable to connect your phone to just about anything and vice versa. One end features a male USB-A connector that can also transform in to a male micro-USB connector while the opposite end has a female USB-A connector as well as a male micro-USB connector.
This cable is designed to connect your phone to a keyboard, mouse, hard drive, etc to your phone as well as charge it or connect two phones together to share files. It is also possible to do some combinations of the above mentioned connections.
Overall this is a well made cable that allows for some unique connections. While this cable may not be for everyone, it will help many people accomplish things easily.
If you are interested in this cable it can be found here.