This app let you to scary some annoying barking dogs or neighbour cat. It could be also used to as a anti mosquito, if you set very high frequency. Animals have better hearing than people, some sounds can be very unpleasant for them. Don't believe? Ask my neighbour's dog
1. Some phones speakers can't generate highest sounds
2. Don't working on deaf dogs
Note: This app present Airpush advertisements in your notification bar. All the Permissions are for advertising, which is to support the development for this app.