EFFECTIVE & HUMANE BARKING STOPPER --- The dog's bark will trigger the sensor, causing shock and warning sound to the barking dog. With the intense tones, your dog will quickly stop barking. From now on, you are free from night time barking and excessive barking! UPGRADED & SAFE INTELLIGENT SYSTEM --- There is a smart barking detection chip in our no barking collar. Intelligent barking vibration detection prevents false triggering. Only your dog's barking can trigger the collar while other dogs' barking nearby can’t trigger it. 3 MODES & 7 ADJUSTABLE LEVELS OF CORRECTION --- There are Sound, vibration and shock modes and the stimulus repeat through 7 correction levels. You can push the “+” or “-” button on the collar for adjustment for the most suitable mode and level freely as your need. AUTOMATIC & ADJUSTABLE --- Just install a 6 volt alkaline battery, adjust the strap to the size of your dog’s neck and it automatically begins doing its job. With the adjustable feature, it is suitable for most dog within 15 to 120lbs, such as Chihuahua, Samoyed, Akita, Beagles, Poodle, Dobermans, Shepherd Dog, etc. WARRANTY & GUARANTEE --- Please read the instructions clearly and ensure the correct mode before putting the bark collar on your dogs. If you have any issue, please feel free to contact us!