Whistle training remains one of the most effective means of distance-training your dog . Acme have been producing quality dog whistles since 1860.
 
210.5
Single frequency (5900 Hz) dog whistles, frequency varying +/- 20% on blowing
 
Suitable for all dogs, especially older or hard of hearing dogs. The best of the Acme range for close work. Good sound at gentle blowing. Great for Spaniels