The Plopp-O-Meter not a bottle opener in the usual sense but a repleacement for a lighter or anything else with a hard edge. You still need the skills to get the bottle open and it keeps the challenge in the game. The measuring is in an internal scale, adjusted to have a maximum of fun.
The volume of the “PLOPP!” is detected by a microphone and the Plopp-O-Meter shows the loudness on a scale from 0.0 to 9.9.
The result stays on the display long enough to show your buddies that you just outscored them and someone else will buy the next round of beer.