Ultrasound Dog Repeller Anti Barking Device Handheld PET Repellent Dogs Training Sonic Pet Bark Control Deterrents UP to 16.4ft Main Features - Use ultrasonic sound to train dog or stop dog's barking. Effective and harmless. - The maximum effective range is 16.4 feet. - LED power indication. - Powered by 4pcs of 1.5V AAA battery. ?not included? - Unit size: L*W*H = 3.62*1.63*1.26inch Bark control and dog training: Ultrasonic Dog Bark Deterrent is a great device for Dog Training and Dog Bark Control. The set ultrasonic frequency (25 KHZ) has a certain effect on dogs and helps you correct their behavior. Safe and effective: Bark deterrent device is an innovative solution for Dog barking and correcting unwanted behavior. Ultrasonic dog training device is safe and effective for all types and sizes (5-120 lbs)of dogs. Suitable for the dogs from 6 months to 8 years. Convenience and ease of use: The small size of the Dog bark deterrent fits perfectly in the hand. You can carry it in your pocket. The Sonic dog bark control starts to work with just the push of a button - very simple and easy. Train your dog anywhere & anytime: You can use Stop barking dog ultrasonic devices both at home and during walks. Regular trainings play a very important role in a positive outcome in Barking control! Pay Attention !!!! This package does not include the battery inside. pls buy it in your local market. (4pcs of 1.5V AAA battery)