4 TRAINING BUTTONS - 4 training buttons ... Radio frequency- 27 MHz Includes:-Sport PRO handheld, dog device, 3/4” black collar strap polyurethane-coated nylon , AC adapter, split adapter ...

And I field tested them while walking, trail running, and hunting. I also tested the battery life by turning the collars on and documenting when they required charging. We tested the best training ...