Modes:beeper and static shock. Blowing test function.Humane uses painless tone followed by shock only if barking persistsPatented design with small and fine of meniscus shape.Easy and convenient to test the functionality and sensitivity by blowing.Infinite 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 (pause time must be less than 30s).Adjustable leather leash from 6” to 30” to suit for different dogs: small, medium and large (not for huge).