2 training modes and 4 sensitivity levels: "sound + vibration" and "sound + vibration + static shock". This collar is very convenient for people who have no knowledge of training their dog. Just choose the sensitivity level (4 most sensitive and 1 least sensitive) to train the dog. < p>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 noises and dogs barking next to your dog will not trigger the collar. LED indicators show you the battery level, activity mode and battery status. Protection mode: Smart anti-bark collar. If the collar is triggered more than seven times per minute, it will be temporarily deactivated to avoid damaging the animal. In this mode, the collar will stop for 2 minutes. SUITABLE FOR LONG-HAIRED AND SHORT-HAIRED DOGS: The collar has two different contact points depending on the coat size of your dog. Rechargeable battery and IP67 waterproof: The built-in