Thanks for the reply. Another reason why I don't need a really expensive one - in case it doesn't work for him. I wish saying I would leave him would work for Red too - but when he is in the woods following his nose or a noise, he could care less if I leave him or not..
It will work to improve his selective hearing!!! But it will only work if the collar works consistently. I'd get a decent collar from a good company. A solid re-call could save his life. Many dogs have died taking off after what-ever and getting across a road.