I have ordered the keyboard to use on my Android tablet. As already described several times when just turn it and release the FN key and hold. Then you can the keyboard with a Bluetooth looking tablet / phone / computer and pair. My tip for Android: Swiftkey Keyboard supports hardware keyboards and there you can also select a German layout.
My only complaint is not valid because it was known to me already when purchasing: the keyboard is not black :)
The included stand (yes actually intended for the DS) is collapsible and really very practical and well equipped with a 7 "tablet available.