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. Better understanding between you and your dog: train your dog to behave properly with friendly devices such as Dog bark deterrent devices. Be patient while training your dog and remember to reward your friend with treats. Ultrasonic anti bark trainer protects from excessive exposure. When the ultrasonic button is pressed for more than 8 sec, it shuts off not to harm your dog. Its 100% safe among bark control devices.