The Acme Plastic Dog Whistle is the most popular dog whistle on the market as it is suitable for all dogs. Ideally complemented with one of the other models for close work. The 210 and 210.5 models are especially well proven with spaniels. The 211.5 model whistle has proven best with Labradors and retrievers but they are both truly universal.Dog Whistle FeaturesCan achieve different pitchesWill fit easily into a pocketTough polycarbonate plastic210 Ultra-high with cork210 1/2 High pitch without cork 211 1/2 standard pitch without cork Acme\'s Ref.MPN: AC210, AC210.5, AC211.5Colour: Black, OrangeSizes: 210, 210.5, 211.5PM Ref: 700185