So I about to start whistle training the mobile mop, but I would like DH and I to each have a whistle to save him from loosing mine. I grew up in a family that used the Acme traditional dog whistle and tunning those to have two with the same pitch is a nightmare. So I am looking at other types of whistle so far I have learnt that 210.5 pitch whistles are better for spaniels and 211.5 for retrievers I think. Do you love your whistle if so why? and where did you get it from? Is it a one tone or two tone whistle?