【3 MODES & 7 ADJUSTABLE LEVELS】✅This no bark collar has adjustable sensitivity-Ultrasonic Sound and No Harm Shock. Choose a suitable sensitive level and suitable model for your dog, can effectively stop barking with no harm to dogs. 100% SAFE. 【2018 UPGRADE 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 Dog’s barking will not. This smart design can help your dog avoid unnecessary response of the bark collar. 【RECHARGEABLE AND RAINPROOF】✅This bark collar contains a built-in USB battery, can be fully charged in about an hour and can be used continuously for 14 days. It is IP67 rainproof, so your dogs can wear the collar playing in the rain but swim with collar is not suggested. 【AUTOMATIC PROTECTION MODE】✅When the bark collar is activated continually for 7 times in 1 minute, protection mode will automatically start and the anti bark collar enters to sleep. It will come back to work in one minute, when the display flashes “E”. Protect your dogs better with no handy operation. 【EASILY FIT FOR ALL DOG SIZES】✅Bark collar can adjust the length and tightness（7.9 inches to 23.6 inches） fit all small/medium/large dogs within 6 to 120lbs. The adjustable strap is made from comfortable Nylon which will not harm your dog.