I've placed the collars on a big boy and on the challenger. For now, both seem to work well. MTH charged me $2.00 for each collar. If they keep on working, I'll order more. I believe if and when I have to remove the collar for servicing, I might lesson the collars strength. So having extra collar is a good fell safe. It's nice to know that MTH was so supportive of you. Thanks for the comment. Best, Lou
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