The Pet Convincer employs a unique mixture of acoustic sound inaudible to humans and air;The Safe, Humane & Easy Training Device - No Shocking, choking, or chemicals.;Permanently corrects dog's behavior - use when you catch your dog performing a bad habit.;Uses replaceable CO2 cartridges - each one lasts around 25 bursts of air - 2 cartridges are included;Corrects: Excessive Barking, Aggression, Stealing, Digging, Jumping, Whining, Chasing, and much more