Dog Whistle Stops Barking, Teaches Recall and Tricks: Yes, weve developed a better dog whistle to stop barking and help train your dog. More frequencies mean better results for any pooch, at any age Bonus 49 cm lanyard included: Yes, you can take your dog whistle anywhere! Never lose your whistle or your frequency setting the protective cover keeps the frequency adjuster on lockdown. Adjustable Frequency + Frequency Lock: Yes, our dog whistle has more frequencies. Proprietary precision grinding results in a finer frequency range, which is why Simply Natural includes a frequency lock so you never lose your dogs perfect pitch. Choose a better Eco-Friendly Dog Whistle: Yes, we care about quality and the environment.