The invention's physical appearance is unknown. In the series, it was seen in The Pranking Quarterly Magazine where the invention was featured in the magazine in The 6D. It was revealed that this marks the 713th time in a row that one of Danny's inventions was featured in this magazine.
As stated in the magazine, you can choose the BDR (Buttocks Development Rate) on the scanner, and inject the liquid in the victim, via the pointy needle. Then, after about 20 seconds, the user will grow a second butt. To undo the second butt, just use it again.