Automatic protection? If the collar is triggered more than 6 times in 1 minute, it will enter protection mode, which will deactivate it for 1 minute to ensure the safety of the dog. This mode is to protect your dog and give him time to calm down. 3 Effective Training Modes: Sound, Vibration, Static Shock, each mode has 0-8 adjustable intensity levels, can be combined freely. Level 8 is the most. Level 0 means this mode is off. The most effective mode can be chosen to train the dog, depending on its nature and behavior. Intelligent Bark Detection Chip: The built-in bark trigger sensor This collar will detect all noises, then filter out only barking to trigger (barking frequencies: 1000-2000kHZ, 80-90db). The collar will only activate when your dog barks, which will allow you to train your dog properly. Rechargeable and IP67 Waterproof: The built-in rechargeable lithium battery is large capacity, and only takes 2 hours to be fully charged, and it offers up to 21 days of use. Charging is