I am a Veterinarian that replaced a sport dog that stopped working after a couple years and this is a great collar. I like the sound volume adjustment so that the beep for return can be very soft (my lab listens to that well) if you want it to be or loud if our puppy needs it. The lock is nice so you don't accidentally press a button in your pocket. I like the light for my black lab in the dark - it is just enough to see him but not obnoxious. Great collar strongly recommend it.