Intelligent Bark Detection - The next generation anti-bark collar adopts the latest sound sensor will detect and filter sound more accurately and faster, and will only activate when your dog barks. No more false triggering. You can’t go wrong with this smart necklace Multiple Modes -Included beep/vibrate/shock/beep+vibrate+beep+shock/ and beep+vibrate+shock, effectively stop barking without harming dogs. 1-7 levels adjustable sensitivity, 0-7 vibration/shock speeds, you can choose the right one for your dog Self-protection mode - When activated 7 times within 60 seconds, the collar will enter self-protection mode and the display will flash “E”. A minute later, it will return to working mode. Protect your dog well and make him feel safe Rechargeable - Built-in 280mAh rechargeable battery, NO battery replaced, ECONOMIC AND ENERGY SAVING. Fully charged in one hour via USB, gives you 10-15 days of regular use. Note: the adapter current should be less than 1A. Adapter not included