Donner Electronic Bark Control Dog Collar for Small, Medium & Large Dogs Patented design with small and fine of meniscus shape Easy air blowing method to test the collar 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 18cm to 60cm to suit for different dogs: small, medium and large (not for huge) High quality with reasonable price, easy operation with practical function