Harmless System: This anti-bark collar has 7-grade adjustable sensitivity and 3 training modes：Beep,Vibration and Shock,0-7 adjustable grade separately,which allows you choose a suitable sensitive level & model for your dog but not harm to dogs. Intelligent Recognition Sound System: Intelligent barking vibration detection instead of sound detection chip prevents false triggering.Only your dog's Sound combined with Vibrations of Sound will trigger the sensors while other Dogs'barking will not.This smart design can help your dog avoid unnecessary response of the bark collar. Adjustable Rope: The adjustable and tear resistant nylon tape features a low-visibility reflective line for safety. Rechargeable and waterproof: This bark collar built-in USB battery,can be fully charged in about 1 hour and can be used continuously for 14 days.It is IP65 rainproof,so your dogs can wear the collar playing in the rain but do not swim with collar. Easy to Operation: 1 to 7 Sensitivity level can be adjusted to fit for different kinds of dogs and specific environments.The level numbers can be seen on the screen and the 3 buttons represent three different models,so just push the related button and you will get the effect you want.