Pretty sunshine of your life，welcome to my storeFeatures:1. Easy air blowing method to test the collar.2. 7 levels of sensitivity adjustment by "+" and "-" buttons， to be suitable for different dogs.3. 2 training modes: beeper and static shock.4. 7 different combinations of beeper and static shock to train dogs effectively.5. The collar turns into 1-minute-automatic protection mode after 7 times consecutive working.6. Adjustable leather leash from 6" to 30" to suit for different dogs: small， medium and large.7. High quality with reasonable price， easy operation with practical function.How it works:When your dog barks， the vibration of your dog's bark triggers the sensor probe. The collar then administers a static correction through the contact points. It begins with the lowest level of correction and increases through the six levels each time she barks within 30 seconds of the previous barks. Once she stops， the collar will reset itself to the lowest level. When she barks again， the process will start over. Along with each static correction， the collar will also beep.Static correction is a very mild tingle， and the collar adjusts the correction based on your dog’s temperament. She will quickly learn not to bark when the collar is on. As an added safety feature the Bark Control Collar will automatically shut off for 3 minutes if your dog barks 15 times or more within 50 seconds.When using your Bark Control Collar for the first time， fit the adjustable strap to your dog and wait nearby until your dog barks. Most pets will quickly understand the new sensation is telling her to be quiet.Specifications: Main Material: ABS PlasticColor: BlackPackage Includes: 1 * Anti No Bark Control Collar for Training Dog StopEnjoy the best day of your life.