SENWOW No Bark Dog Collar Electric Anti Bark Shock Control Collar with 7 Adjustable Sensitivity Control, No Harm Warning Beep and Vibration, for 10-120 Pounds Dogs EFFICIENT ANTI-BARK COLLAR: upgraded version bark collar with improved anti-bark chips, Stops unwanted barking with progressively increasing warning sounds and harmless static stimulus. Humane DESIGN: The stimulations repeat through 7 correction levels, the intensity gradually increases until the dog stops for thirty seconds. If the continuous stimulus reaches the 7 levels, then the Collar will stop working for 1 minutes to protect the dog. SAFE PRODUCT: we provide a small testing unit and two sets of electrode prongs. You can test and choose the suitable level for your dog. FITS ALL SIZES: Effective on a 10-120pounds dog, 7 sensitivity levels (1-7) adjustable for the different size of dogs barking through the "+" /"-" button. BUY WITH CONFIDENCE: We provide 1 year warranty, please buy with confidence and feel free to contact us if having any question, well get to you within 24 hours.