I have had many training collars for dogs. My family owned a game farm and raised 25,000 mallards and 7,500 pheasants per year. Been around dogs and dog-training a bit.
Could not find all the parts to one of the existing collars and leaving for SD to go pheasant hunting, bought one of these, because there was nothing in my overly messy house that was ready to go. Worked very well, only used the noise level, except maybe once or twice. I shock myself at levels I will use prior to using the shock mode on a dog. Sound level did it's job 99% of the time with a nine-month-old pup. Only weakness and it is a big one if you are hunting. You need to look down at the control to use it. Just not designed for working on touch, I always turned it off since I thought sitting in my chest pocket it could very easily send an unintentional signal (a simple safety on the device would have been appreciated). Work for my 9-month-old pup/dog. Need to walk with her in some local parks to get her a little more tuned into the smells and habits of pheasants. This is my last dog and do not have the energy I once had, but that is on me not the collar.