High Grade Dag Whistle: : Our Dog Whistle Is Made Of High Quality Stainless Steel, 100% Safe, Strong And Durable. The Ultrasonic Dog Whistles Do Not Affect Your Dogs Hearing. Very Suitable For Training Dogs.Adjustable Frequency: : Our Ultrasonic Dog Whistle Trains Dogs To Perform Different Actions By Making Sounds Of Different Frequencies. It Should Be Noted That Every Time You Blow The Whistle, You Need To Pay Attention To The Dog'S Reaction, So You Can Slowly Train The Dog To Get Acquainted With The Sound And Perform Appropriate Actions.Easy To Handle: : By Adjusting The Nut And Adjusting Lever For Sounds Of Different Frequencies, You Can Observe The Dog'S Reaction To Each Sound For Better Training.Train Multiple Movements: : With Our Dog Whistle, You Can Make Your Dog Perform The Appropriate Action Without Shouting Loudly. For Example: Stop Barking, Sit Down, Shake Hands, Remember, Etc. Anti-Lost Design: : Our Package Came With 3 Whistles And A High Quality Lanyard. It Can Be Hung Around The Neck And Will Not Disappear Due To Its Small Size.