SportDog SD-825X SportHunter 825XTheSportDOG SportHunter 825X is our introductory e collar to the long range. The remote is designed to be operated without having to look at it, needing only a slight movement of the dial and the push of a button to deliver stimulation. Highlights: Coverage Area: 4800 sq. ft. Battery Type: Lithium Ion 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