The SportDOG Brand YardTrainer 100S Electronic Dog Training Collar offers a higher range of static stimulation, specifically for large or stubborn dogs. This is a great electronic dog collar for basic obedience training around the house, yard, or park, or any situation where the dog is within 100 yards of the trainer. Choose from 3 stimulation types: vibration, tone, or static; and 8 levels of static stimulation. Each stimulation type has a dedicated button, allowing you to easily deliver the stimulation that best suites the training situation or your dog's temperament. DryTek technology makes the unit waterproof, and submersible to 25'. Both the transmitter and the receiver run off rechargeable Lithium Ion batteries (included). The YardTrainer 100S Electronic Dog Training Collar includes: transmitter, receiver with collar, lanyard, charging cable, long contact points, test light tool, and basic training instructions with pro trainer Charlie Jurney. Manufacturer model #: YT-100. For large or stubborn dogs 100-yard range 3 stimulation types 8 levels of static stimulation Waterproof and submersible to 25' Rechargeable Lithium Ion batteries Training instructions from Charlie Jurney