ALEKO TS-BC14 Voice-activated Shock Collar Barking is the nature of the dog, This product is provided with Voice-activated shock After a time of training,the dog will learn that shock only acts as a punishment The electric current of the shock will never hurt your dog,you can be assured of use it. Leave your pet at home, and don't worry about him messing with your neighbors The louder the dogs barking, the louder of the alarm sound