The Dog Trainer is base don dog whistle. But it may be used with other pets.
As most of pets can hear higher sounds then humans and as sound is higher it will draw more attention. But unfortunately most phones and tablets can't reproduce extremely high sounds, what ever manufacturers wright in specifications. Thus we picked high frequencies but still in range of the most phones. Maybe only frequency of 14KHz will be a problem for some phones.
This utility can reproduce 5 different tones. Use them for five different commands, and use the same sound for same command every time. In first time say command while you pressing a button, e.g. "sit" and soon your pet will learn to do the command just on sound.