You will set the correction mode that you want to turn on, along with the intensity level for each correction. 1 is the lowest, and 7 is the highest. If you don't want to use the vibration & shock correction, simply adjust the intensity level to 0.
Once you've set the correction mode and intensity, put the collar on dogs neck and the collar is ready to work. Once it detects the dogs barking through the sensor that is located in the middle of the metal probes, it will automatically send off correction cycle that you have set, starting from the mild to the strongest correction.
Please make sure that the metal probes touch the skin of the dog, this ensure the distance of the collar to detect his barking, and corrections being properly sent to the dog.