The SportDog YardTrainer SD-105S is designed for dogs weighing a minimum of 8 pounds, and is highly recommended for small to large dogs with a stubborn temperament. This high quality stubborn dog remote trainer features an activation range of up to 100 yards. This SportDog YardTrainer can be used in the home, back yard or local dog park. This stubborn dog remote trainer features three stimulation settings: tone correction, continuous correction, and intense continuous correction. The tone stimulation will emit an sultraonic sound as corrective stimulation, while the continuous correction setting will emit a safe electronic impulse. The intense continuous correction is set at two different levels above the standard continuous correction level, for times when your dog needs immediate correction. This SportDog YardTrainer is a great choice for dog owners with little to no experience using a remote dog trainer.