Dog Anti Bark Collar [2020 Upgrade Version] No Barking Collar Dog Small Bark Collar Shock Collar with Beep Vibration Harmless Shock Rechargeable Anti Bark Control Device for Small Medium Large Dog knee support Conductive silicone sleeve on contact Conductive silicone sleeve on contact point is better to avoid skin damage during training The collar includes 6 levels of progressive correction which means if your dog continues to bark the static correction with automatically increase the next level until he stops “rechargeable bark collar” Only your dog's barking can trigger the no bark collar while other dogs' barking nearby can’t trigger it