ACME Dog Whistle 211.5 (Black, Orange, Lime Green, Snorkel Blue, Yellow, Pink, Coral, Purple, Baby Blue, Turquoise, Red and Green)
 
Medium high pitch, single note, preferred by Labrador and Retriever trainers; good distance whistle.
 
Single frequency of 4850Hz.
 
This whistle is recommended for both use in Town and the Countryside.
 
It is the best whistle for Retrievers.