Tarakash Josh!

It is a strange gadget! It is a USB cable, and there is a SD card reader attached to it.

So now you don’t have to buy USB and card reader separately.  With this cable/reader you can power up your device while transferring data from the card and USB as well.

But there is a problem; you cannot use both the device simultaneously.  But the good thing is, now you can save your table space, as you have a USB cable on your desk anyway, there might as well be a card reader built in to it.