Ultimate Training & Behavior Aid: Immensely Popular E-Collar used by Expert Trainers & First Time Pet Owners; Can be used to help correct barking, walking, leash training, sitting, aggression, and other behavioral obedience. Multiple Training Modes: Dog Shock Collar with 0-100 Levels of customization for Static Stimulation & Vibration and a standard Tone (Beep) Mode. Three types of stimulation make it guaranteed you will find a stimulation mode that works for your dog. 330 Yard Remote Range: Designed with RF434Mhz technology to provide a range up to 330 yards, easily train your dog in the park or backyard. Adjustable collar strap, fits neck sizes from 15 to 22 inches. Rechargeable & Water-resistant: Collar receiver and transmitter can be charged and are water-resistant. Easy to use with quick synchronization between transmitter and collar receiver, within 10 seconds.