1The bark stopper has 4 functions that is vibration, electric shock, warning and dogseeking light. 2The shock gears are 099 gears, you can adjust the grar according to your needs. 3The strap of the bark stopper can be adjusted and can be shared by big and small dogs. 4The strap of the bark stopper can be illuminated at night, and you can easily find your dog, even in the dark night. 5Made of high quality ABS material, durable and reliable, you can use it for a long time due to its long service life.