Training modes and 4 sensitivity levels: "tone + vibration" and "tone + vibration + static shock." This collar is very convenient for people who are inexperienced in training their dog. Simply select the sensitivity level (4 highest and 1 least sensitive) to train your dog. Anti-interference: This collar is equipped with smart sensors and chips that can detect the barking of the dog wearing it. The sensor filters out all noise, so dogs barking near your dog will not trigger the collar. LED indicators inform you of the level, activation mode, and battery status. Protection mode: Smart anti-bark collar. If the collar is activated more than 7 times per minute, it will temporarily deactivate to avoid harming the pet. In this mode, the collar will not work for 2 minutes. Suitable for long-haired and short-haired dogs: The collar has two different contact points, depending on the thickness of the dog's hair. Rechargeable Battery and IP67 Waterproof Rating: The built-in rechargeable lithium