Blow my Whistle Fan - a three whistles in one app: - dog whistle - a choice of sounds in four different frequencies (including ultrasound), so you can call your pet, play with your puppies or use it for training. Animals can perfectly hear specific frequency sounds emitted by this application (even as they are inaudible to humans). - S.O.S. emergency whistle - one touch (SOS) you can run cyclical, loud whistle. Very useful in emergency situations, when you need help or assistance, when you