Hello Forums, It's a great honor and privilege for me to introduce you our latest Dog whistle training kit. iPhohe: https://itunes.apple.com/us/app/free-dog-whistle-training-kit/id408621114?mt=8 iPad: https://itunes.apple.com/us/app/free-dog-whistle-for-ipad/id411852920?mt=8 We choose frequency between 6 KHz and 22 KHz, which are frequencies that dogs are more sensitive to. You may not hear some of them but dogs do. With these selected high pitches, you can now potty-train your puppies. House training has never been easier. The dog teaser feature is also added to Version 1.7.1, tease your dog and enjoy! We provide training tips and FAQs in manual. Before teaching old dogs some new tricks, please make sure you do read some training tips.