Humanized Impact Free Bark Collar - Provides efficient performance with sound (beep) and 7 vibration modes. It can help your dog understand that barking is not desirable. You can correct your dog's behavior with this shockproof small bark collar. USB Rechargeable Version - Each rechargeable dog collar contains a built-in USB Li-Polymer rechargeable battery that lasts over 20 days on a 2-3 hour charge. 2022 IMPROVED BARKING BEHAVIOR CHIP - To apply premium neck straps to small, medium or large dogs, we have enhanced our unit with 7 adjustable sensitivity levels to suit any breed of dog. Other dogs won't interfere with your sonic bark collar HIGH QUALITY MATERIALS ENSURE DURABILITY - Even with frequent use, our bark free collars can be used for a long time without any problems by employing high quality materials and techniques. Adjustable and reflective straps made of comfortable nylon fit mini/small/medium/large dogs from 6 to 120 lbs. Dog training clicker as a bonus - Dog training clickers are a great gift for you to add fun interactions with your pets!