2 training modes and 4 sensitivity levels: "sound + vibration" and "sound + vibration + static shock". This collar is very convenient for people who have no information about dog training. Just select the sensitivity level (4 most sensitive and 1 least sensitive) to train the dog. Anti-interference: This collar is equipped with a smart sensor and a chip that can detect the barking of the dog wearing it. The sensors filter out all noise, dogs barking next to your dog will not trigger the collar. The LED indicator lets you know the level, the activated mode and the battery status. Protection mode: Smart anti-bark collar that temporarily deactivates to avoid hurting the animal if the collar is triggered more than 7 times in one minute. In this mode, the collar will stop working for 2 minutes. **Suitable for long and short haired dogs: The collar comes with two different contact points, depending on the length of the dog's hair. Rechargeable Battery & IP67 Water Resistant: The built-in