Sportdog SportHunter 825X, Introductory E-Collar To The Long Range, Uses The Smallest Collar While Still Providing Up To 1/2 Mile Range For Up To 3 Dogs, With Additional Add A Dog Collars, Not Included, Designed In The Field By Hunters & Dog Trainers Just Like You, Allows You To Communicate With Your Dog Using Tone, Vibration, Or 1 Of The 21 Levels Of Static Stimulation, Remote Is Designed To Be Operated Without Having To Look At It, Needing Only A Slight Movement Of The Dial & The Push Of A Button To Deliver A Stimulation, This Customizability & Ease Of Use Ensures Your Training Is Consistent, Immediate, & Tailored To Your Dog's Unique Personality.