Petiner Electronic No Bark Control Dog Training Collar with Adjustable Sensitivity Control-Black Powerful-Petiner Bark collar warn with beep,and then send harmless static shock to the dog whenever it barks Intelligent-Microprocessor will distinguishes your dog's bark from other noises, repeat through 7 correction levels, the intensity gradually increases until the dog stops barks for thirty seconds Safe-If the continuous stimulus reaches the 7 levels, the Collar will stop working for 1 minutes to protect the dog Adjustable-An adjustable collar strap And Sensitivity switch freely adjustable for the different sizes of dogs barking and specific environment Don't encourage you to use it for puppy, especially below 8 lbs.This bark collars is not waterproof.Don't let it contact with Water damage, the dog urine ,It has the potential to cause a short circuit, to burn out the motherboard chip