The codes can with jumpers (like hard drives) change; However, this is quite a fiddly job in Gong itself, since even the jumpers are not taken precisely with tweezers.
To put dise in Gong, the housing should (4 screws) to open and then again the 3 little screw that holds the card in the housing unscrew.
Then you can put the jumper in excellent Gong itself.
Additional jumper, also 2 double-adhesive strips and screws, and anchors, the package will be.
Also, it need not necessarily be batteries, accus rich also. (AA-size)
The Bed.Anleitung is the way behind the Gong, behind the cardboard, the one when she slips out not by chance only place when you take apart the entire box.
For a better understanding, I have the bed. Instructions once scanned and attached to the images.