Safe and Effective Bark Stopper The upgraded dual-frequency ultrasonic wave combines fixed and variable frequencies, which makes it suitable for a wider range of dog breeds and can stop bark more effectively. Anti bark for dogs can also help you train your dog and correct bad behaviors such as endless barking, digging, chewing furniture, eating unsafe food and fighting. Easy to Use Bark Stopper You just need to press the button, then when you hear a beep, it means the bark deterrent is sending ultrasonic waves to your dog to remind him to stop barking. Ongoing training provides effective and lasting results. Handheld and portable design pet gentle anti-bark device is small and portable. It is easy to carry while walking the dog, walking or running. With an effective range of 16.4 feet, it's perfect for training your dog at home or outdoors. It also prevents other dogs from approaching you while jogging, walking or running. Note:1. Please allow a little error due to manual measurement. Please make sure you don't mind before bidding < br> 2. Color may vary by monitor. Please understand that Note: Hello, please pay attention to your delivery address when purchasing the product. If your pickup information (e.g. name, street, house number, doorbell/email with no name) is incorrect, the order will not be delivered correctly. )