Sportdog sporthunter x-series 1225x 3/4 mile range 21 levels FEATURES:-Up to 3/4 mile range-21 levels of stimulationWaterproof Other Features: 3/4 mile range, 21 instantly selectable static stimulation levels, low/medium stim ranges , tone & vibration options, rechargeable l-ion batteries expands to 3 dogs with add-a- collar system, waterproof, intuitive, no look operation lets you stay focused on your dog,