The SportDOG BrandSportHunter1825X boasts one-mile range - the farthest in the SportHunter family. The SD-1825X model also supports the highest number of dogs - up to 6, with purchase of Add-A-Dogcollars. Designed in the field by hunters and dog trainers just like you, the SD-1825X allows you to communicate with your dog using tone, vibration, or one of the 21 levels of static stimulation. 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 a stimulation. This customizability and ease-of-use ensures your training is consistent, immediate, and tailored to your dog's unique personality.