@jasdksdc It's the same as a long line essentially, it's building successful repetitions until a habit is created.
I worked extensively on the habit building, lots of quick touches, every release is a touch first and then free.
For recall the ecollar isn't necessary for me anymore but I use it for further development of distance work which is mostly done with a mild vibration.
I've gone ecollar free on occasions, flat battery or swimming no issue, it's training, rewarding, enforcing and persistence. If it was enforcing without training and no reward or consistency then it's unlikely to be successful.
I see no issue with putting the ecollar on though, the dog loves it, gets excited for adventures.
We have used the ecollar harshly at times with professional assistance with aggression, reactivity sessions as well and interrupting extreme reactivity which saved this dogs life... and no issue, it still loves it and us as much as ever. Though it is a heeler and I suspect they like corrections