Whistles are a bridge or secondary reinforcer, basically you don't speak bird and your bird doesn't speak english (mostly!), so the click can help let your bird know it has done the right thing at the right time and makes training much faster. Come with a downloadable 'How to Use Your Clicker/Whistle' instruction guide.Parrot Life® Tip: These are great for those that prefer their bridge to be hands free. You will soon get the hang of the air pressure to put on the whistle to get the desired noise, then try to stay consistent when using as a bridge.