H. Lawrence 5 out of 5 05.20.2016 at 12:54 pm This is my second garmin Alpha/TT15 Mini Deer combo I’ve purchased from them in the last year. I run Beagles and the mini collars fit my dogs perfect and the range is the same as the standard tt15. The only difference I see is the battery life. This system has made hunting so much more pleasurable being able to train and correct the dogs in the feild. I wish I would have bought the Alpha when they first come out instead of waiting so long. Throw in the combo that outdoor dog supply throws in, and it is a home run!