How it works the Dog Whistle for training your Dog: 1. Grab some treats and head to a quiet room. 2. Allow your dog to walk around without giving any attention to it. Then blow to whistle and reward your dog with a treat. Teach your dog to associate good things with the whistle :) 3. Repeat this 5 times per session and spread the sessions out over the course of a week. 4. Focus on the training and make this lightweight dog training whistle part of you. 5. Adjustable to multiple frequencies, such as Audible Mode; Where the can be heard by Humans or you can change the frequency to 'Silent' 【ADJUSTABLE FREQUENCIES】Different dogs respond to different frequencies. Our dog training whistle has a nut and screw that would adjust the frequency when turned. Notice your dog's reaction to each setting until your dog exhibits the strongest reaction 【EASY DOG TRAINING】This is a great tool for you to teach your dog obedience and to learn basic skills. Train your dog with the ultrasonic whistle so that you don't need to shout out loudly. 【EFFECTIVE DOG TRAINING】Your pet can hear the dog whistle up to 25 meters away even if they can't see you! Train your dog with different commands and get them to follow your instructions. (Sit, Paw, Lay Down, Up, Heal) 【ANTI-LOSS WHISTLE】The Emlimny dog whistle body is crafted with stainless steel coated with a protective lid to prevent dirt, damage, and accidental loss. It is extremely easy to wear around your neck with our matching black lanyard. 【NOTE】Please note that this puppy training whistle wouldn't make your dog understand your instructions immediately. It requires multiple training for your dog to listen your commands. Use the rewarding-positive-behavior approach to make your dog a listening and obedient friend. When the dog is 3 to 7 months old the training effect is the best.