CBoner Bark Collar Upgrade Sensitivity Rechargeable Dog Barking Control Training Collar for Small Medium Large Dogs Beep Vibration Safe Shock or No Adjustable Sensitivity breast pump Multiple size and finish options Multiple size and finish options are available is vented on all sides and features secure spring lock door latches Choose shock gear according to your dog response to the collar Sound combined with Vibrations of Sound trigger the sensors: Only your dog‘s Sound combined with Vibrations of Sound will trigger the sensor 9 oz Package Includes: 1 x No bark receiver 1 x Adjustable Nylon Collar 1 x Test Light 1 x USB Link 1x instruction