Anti barking device: Ultrasonic Dog Trainer is a great device for Dog Training and Dog Bark Control. Ultrasonic frequency (25 KHZ) has a certain effect on dogs and helps you correct their behavior. Safe:dog barking deterrent is innovation among barking control devices to correct unwanted behavior and stop dog barking. Its effective for dogs of all types and sizes of age 6 months to 8 y.o. Convenient and easy to use: Small in size the Bark Control Device fits perfectly in the hand. You can carry it in your pocket. Anti barking device starts to work with just pressing a button. Simple! Ultrasonic dog barking deterrent is rechargeable. It gets charged in only 2 hours and works about 14 days with 1 battery life. USB cable comes with the device. 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