HugSmart Pet Bark Control Device Ultrasonic Sensor Dog Repellent Training Deterrent 2 in 1 Variable Frequency Hand-Held Range of 5m 100% Safe Wrist Strap LED Indicator Outdoor Indoor to use. The Ultrasonic Sound Can Only Be Heard By Dogs to stop biting furniture, chewing unsafe staff, digging the carpet, fighting the small pets without yelling, and shocking. The LED indicates working status and low power mode. Push the button, the bark control device will emit an ultrasonic sound, the green light will be on to show the device is working. The red light will be on when low power. With a frequency button, adjust the ultrasonic frequency according to the dogs' condition conveniently. The control range of the bark control device is 16.4ft. The handheld anti-barking devices can be used on dogs from 6 months to 8 years old. The Anti-bark device comes with the latest ultrasonic tech with frequencies 25KHZ. It will not bother hum-beings except dogs as the dogs have a wider range from 15HZ to 120KHZ. The Ultrasonic barking control tool is designed for Dog training highly effective and long-lasting use. It is lightweight, fits the pocket, and suitable for indoor-outdoor use. The wrist strap is convenient to carry