You don't mention what kind of dog you have or what you will be doing with your dog, but since you mention that it's been started by a professional trainer I would assume you intend to use it as a hunting dog. In which case this collar is probably not appropriate. 100ft of usable distance is too small for any practical use in the field.
Sorry about that. I have a Nova Scotia Duck Toller and have used him for upland and ducks.
After posting I did a bit more reading and realized that the range of the Smart Delta was only 100 ft and thought more about getting my phone out and opening an app every time I wanted to use the collar. I ended up getting what my trainer used, a Garmin Pro 70. There is a rebate on them at the moment ($50 USD) so it ended up being a little bit more than the Smart Delta, but range is much better. I also liked the remote lights on the collar.
Thanks all for the info.
SS