iMeshbean 2 Pack Advanced No Bark Dog Collar Training Electric Anti Bark Shock Control with 7 Levels Button Adjustable Sensitivity, Stimulation of No Harm Warning Beep and Vibration iMeshbean is a registered trademark and "Newgate-Ships from CA"is the only authorized seller of iMeshbean branded products The Collar is controlled by a microprocessor which sends harmless static shock to the dog whenever it barks Adjustable nylon collar senses vibration in dog's throat during barking Effective on dogs from 5 pounds to 150 pounds Customer satisfaction is our NO.1 prority, if you have any issue , pls contact us and we will try our best to solve it for you with satisfactied solution.