CLD Brands Best Dog Training Whistle - Bonus User's Guide and Training Tips - Adjustable High Pitch Frequency - Control Barking &ndash; Teach Commands - Discipline - Get Attention OBEDIENCE TRAINING: Train your dog to follow simple commands such as "sit", "come", stay, down and to change direction by using different whistle patterns for each one. MULTI-PURPOSE: The ultrasonic dog whistle can also be used for other pet birds (such as pigeons) to establish a good tool for communication and discipline as well as to train hunting dogs. USER'S GUIDE: FREE eBook with Training Tips for Your Dog and INSTRUCTIONS FOR USING THE TRAINING WHISTLE. DISCIPLINES: Are you out of things to do to silence your dog? Simply blow the ultrasonic whistle using the right frequency and get your dogs attention when nothing else seems to work. ADJUSTABLE FREQUENCIES: By simply turning the screw at the end of the whistle, you can adjust the frequency to find the one that your dog best responds to. HOW ABOUT THE NEIGHBORS DOG?: The ultrasonic whistle is the best safe deterrent for the neighbor's dog. It will begin to respond too. No more unnecessary barks! CAN HUMANS HEAR IT or IS IT COMPLETELY SILENT?: Please note this whistle is not COMPLETELY Silent. You will hear it when you use it. This dog whistle, as well as ALL silent dog whistles, does produce a secondary audible sound. This sound is produced by the volume of air that goes across the whistle. Blowing lightly on the whistle reduces the audible sound, and actually increases the ultrasonic sound that dog's hear. 100% SATISFACTION GUARANTEE: When you purchase from CLD Brands your satisfaction is guaranteed. No HASSLE, No QUESTIONS. It's that simple! If for any reason you are unhappy with any product by CLD Brands, please do not hesitate to contact us. We take full ownership and responsibility for the quality of our products and will do our very best to solve your problem quickly and efficiently!