SportDOG Brand TEK Series 1.0 GPS Tracking + E-Collar System - 7 Mile Range - Waterproof and Rechargeable - Tone, Vibration, and 99 Levels of Shock - Expandable to Locate and Train up to 12 Dogs US version only 7-mile range 99 continuous, momentary, and rising stimulation levels Vibration and tone options Expandable up to 12 dogs with additional collars