This cable makes it possible to connect USB Pen Drive or Card Reader to your Device for reading your data . The connection is so easy, just plug the Micro USB Side to your Device and plug your USB Flash Drive to the USB A Side, then your Device can read the data inside your USB Flash Drive.
Personally Tested and works perfectly with SAMSUNG GALAXY MICRO USB SUPPORTED MOBILES
It Should also work the same for other Android Devices with custom ROM/Kernel that support USB Host mode.
With this Micro USB Host OTG cable, you can assess to most of USB Flash Drive, Mouse, Keyboard and etc.
It should work with most USB Flash Drive, Mouse and Keyboard, but please note that some of them may not be compatible, As it depends on the driver database of Device whether it would have or not the same.
There is not time lag of playing a movie file on my USB Flash Drive and it can be played directly with this USB Host Cable
It also work with external hard-disk, BUT It need external power source for the hard-disk
It also work with non-power card reader.