I recently bought the Sportdog SD-425E from "The Dog Line" and I am really pleased with this ECollar - dog training collar. My dog 'Bella' is a 4 year old LabradorexBoxerxStaffy and I have had her for the past 2 years; - have spent some time with training her but she has this tendancy to chase after Bush Turkeys (Qld local wild birdlife) if she knows they are around when we go for walks to the beach of forests. With the Sportdog SD-425E I am able to keep her under complete control. She will walk with me now, instead of darting off and doing her own thing. Much better that the 'Dogtra IQPlus' that I had a year ago - forever had problems with this brand and had to send it back to USA to fix. Would recommend the Sportdog ECollar to anyone who needs to regain control as the Alpha Male!