Keep Better Habits: Learning the art form of farting requires practice and skill. This farting toy has a learning curve, so the more you practice, the better you will be. Just Squeeze: Put the free side up on your palm, make the ventilation hole 2-3cm behind the end of the thumb, and then squeeze the handheld fart machine hard, you can also hear that it is produced by adjusting the position and squeezing speed Different fart sounds.
eBay