Dog Whistle Voice 4 Trainer by Barbecue Army is a free Android app designed to help dog owners train their pets using high-frequency sounds. The app is simple to use and features a range of bleats that can be used to get your dog's attention and encourage positive behavior.

The app's interface is straightforward, with a single screen that displays a dog whistle and a range of buttons that correspond to different sounds. Users can adjust the frequency of the whistle between 1600Hz and 24000Hz, which is beyond the range of human hearing. This makes it an ideal tool for training dogs, as it produces sounds that are audible to them but not to us.

Overall, Dog Whistle Voice 4 Trainer is a handy app for dog owners looking to train their pets. Its simple interface and range of high-frequency sounds make it an effective tool for teaching your dog new tricks and behaviors. However, it's important to note that the app should not be used to harm or distress animals, and should only be used as a training aid in a positive and constructive manner.