Mypet No Bark Collar Anti Bark Collar Electronic No Bark Control Dog Collar with 7 Levels Button Includes receiver, operating manual and replaceable 6-volt battery Waring:This is Not Waterproof,Generally recommend for 15-120lbs dogs. Humane, cost-effective and harmless static shock to the dog whenever it barks. Adjustable sensitively nylon collar senses vibration in dog's throat during barking. It can be adjusted to control the sensitivity of the voice, according to the size of the dog There are a total of 7 levels of correction that will be triggered by your dog's successive barks.