Weight: Due to the low weight, the whistle can be held in your mouth for a long time, so you are always ready to whistle. Signal: with this whistle you can create a clear and distinctive signal. Your dog will be able to recognise the sound with a little training and assign it accurately. Pitch: even if you want to buy your whistle after years, the sound is guaranteed to be the same, as all Acme whistles are frequency standard. Loud: the extremely loud and long-ranging sound outtones even loud background noises. Even your emotional position does not affect the sound of the whistle. Trendy: you can choose between the many different colours of the whistle. For example, you can lie one in the car, so you always have a whistle with you.