Dog Whistle (com.senniksoft.dogwhistle) on Google Play
Firstly, This Dog Whistle app is not for fun purposes. Because it uses high frequency range upto 22Khz that we cannot hear but dogs hear and disturp them in a negative ways. So please respect them ! By this app, you can easly control frequency and amplify it to more higher frequency to get rid of drawbacks of each mobile phones's hardware issues. Many mobile phones cant deliver 25 khz ultra sonic sounds due to hardware speaker of mobile phone but if sound signal amplify it can be so close to that ultra sonic waves. So you can arrange frequency range optimization to get better attention from your dogs to train them or in emergency cases you can set to high frequency to get away from dogs. So this Dog Whistle is designed for this purposes and expected to use it in a good ways. Thank you for supporting us !