The collar doesn't vibrate at the first bark, but if the bark lasts longer the vibration time will lengthen gradually from the second bark to the six bark, continues at the highest frequency vibration about 2 or 3 minutes and then stop automatically. It is a fatherly collar without electric shock. The allowable bark level is adjustable. The vibration level also can be adjusted. The nylon collar is easy to adjust and comfortable to wear, waterproof. The system includes: 1. A waterproof vibration set; 2. A nylon collar which is easy to adjust and wear; 3. Six small batteries which are easy to buy: AG13/LR44(3+3pcs); 4. A special screwdriver used to adjust the level of the allowable bark and vibration.