Features: The Ultrasonic Bark Trainer is a harmless and effective solution to calming dog barking. Our bark control devices are designed ?us to emit an inaudible sound ranging from 35 to 45 HKZ that only dogs can hear, using two transmitters up to 50 feet away to deter hostile dogs. Lightweight and portable, it will not harm hearing of pets or other animals, making daily training safer. This anti-bark device can be used for jogging or walking, cycling, in the park , in the car, at the beach, etc. With a built-in bright LED flashlight, it is perfect for night walks or in low light situations. This is a trainer versatile that can be used as a flashlight, as well as for training and repelling dogs. Specification: Color: Black Material : abs Powered by: 9V battery (not included) Product weight: 56g Package size: 14.1 * 6 * 3.5cm Package weight: 72g Packing list: 1 * anti-bark dog training equipment