3 MODES & 7 SETTINGS: Equipped with 7 levels vibration, 3 training modes of beep, vibration and shock that allow you to use them all together or respectively, you can choose suitable one as you need. (NOTE: SIZE of this collar is 2.7-8.0 inches in diameter) SENSITIVE VIBRATION: The collar can automatically detect the bark of the dog itself and automatically adjust the suitable setting according to different barks while not being triggered by others’ barking dogs. SAFE TO USE: The intelligent collar has an auto protection mode, which means that the collar will shut off if it is activated 7 times continually, and it will go back work after 1min. RECHARGEABLE & RAINPROOF: Once full-charged, continuous working time up to 14 days, easy to charge the collar with USB interface. Rainproof design makes it workable for indoor and outdoor in any weathers. SUIT FOR VARIOUS DOGS: The advanced collar can be stretched from 1.08in to 7.08in, suitable for most size dogs, no matter small, medium or large one, the collar are perfect tool to make them quite.