Traditionally whistles were thought to be the preserve of Gun Dog owners and handlers. However, using whistles to train and control your dogs has now become a much wider activity involving many different breeds.
Ultra High Pitch - with a pea producing a "Roll" sound. Suitable for all breed (4750-5250 Hz), expecially Spaniels
210.5: Ultra high Pitch, without a pea, producing a single, high frequency tone. Suitable for all dogs, especially older / hard of hearing dogs (5900 Hz), perferred for spaniels for close work
211.5: Standard High Pitch without pea, solid tone, high frequency. Suitable for all dogs (4850 Hz), preferred for Labradors
212: Trialer. Small whistle but very high pitched. No Pea. Holds tone over distance. Professional choice, for general use.