The ZelenDecor Anti Barking Device is a two-in-one ultrasonic anti barking device that provides a safe and effective solution for dog training and bark control. The device features a 25kHz fixed frequency and a 30kHz variable frequency, ensuring that one of them can be used effectively. The device also has a 16.4ft effective control range, making it suitable to be used indoors or outdoors. The device also has a rechargeable battery, which charges in 2 hours and works about 60 days.