A PAINLESS AND DISCHARGE-ANTI-BARK COLLAR Our anti-bark collar stops your dogs barking WITHOUT PAIN thanks to a painless vibration and ultrasound technology! Unlike other anti-bark collars with electric shocks, the collar was designed to educate dogs not to bark, but without the atrocity of an electric shock. If you love your dog, you dont want to inflict the pain of an electric shock collar (though surprisingly, it is allowed to be sold!). If your dog barks too loudly or in the long run it can be tiring for you and the neighborhood, so it is essential to educate them as soon as possible! The anti-bark collar is not a simple collar that prevents your dog from barking, it is an educational device. Once your dog is trained with the collar, it will stop barking even without the collar. Our customers: dogs do not need the collar after 2 weeks of use, because they have been educated.The collar works as soon as it is put on the dog. Package Includes: 1*Anti-Bark Collar+1*USB charging cable+1*Instruction manual The leash is 35cm in diameter and up to 6cm in diameter for all dogs. MaterialABS + nylon webbing