Training modes & 4 sensitivity levels: "Tone + Vibration" and "Tone + Vibration + Static Shock." This collar is especially convenient for people with no dog training experience. Simply select the sensitivity level (4 highest and 1 lowest levels) to train your dog. Interference-free: This collar is equipped with an intelligent sensor and chip that detects your dog's barking. The sensors filter out all noises, so barking from dogs in your vicinity won't trigger the collar. The LED indicator shows the level, the activated mode, and the battery status. Protection mode: Intelligent anti-bark collar that temporarily deactivates to prevent injury to the pet if the collar is activated more than 7 times per minute. In this mode, the collar will not work for 2 minutes. **Suitable for long- 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 battery has