JK TECH Dog No Bark Collar Anti Bark Collar with 7 Levels Adjustable Sensitivity Control,No Harm Warning Beep and Vibration Training Collar for Small Medium Large Dogs Easy and convenient to test the functionality and sensitivity by blowing,indinite sensitivity adjustable by gear to suit for different dogs 2 training modes: beeper and static shock 7 different combinations of beeper and static shock to train dogs effectively The collar turns into 1-minute-automatic protection mode after 7 times consecutive working Adjustable leather leash from 6 to 30 to suit for different dogs: 15-120pounds dog