The use of both the sound booster element and the long duration, double beep make the BTB 800 collars are much easier to hear at long range. (Actual yardage will vary depending upon the relative position of yourself and your dog and other variables such as cover and wind speed and direction).
Easy Operation - One touch push button system
Long Range Audibility - Audio booster element
Reliability - State-of-the-art microcomputer technology
Rechargeable Batteries - Charger included