1.SAFE EFFECTIVE ANTI BARKING DEVICE: This anti dog control device uses ultrasonic technology to intervene in barking. When the microphone detects a barking dog, it emits a soft but effective high frequency sound using ultrasonic technology to stop the barking and calm the dog down without causing injury or distress. It stops your dog from barking excessively, helping you say goodbye to the nightmare of sleepless nights and constant disturbances due to your neighbor's barking. 2.4 ADJUSTABLE MODES WITH RANGE UP TO 50 FEET: Our dog bark deterrent device has three adjustable modes. You can choose the one that suits your dog's specific situation. Mode 1: 30KHZ 50KHZ (treble), suitable for large and naughty dogs; Mode 2: 15 30KHZ (midrange), suitable for tame dogs; Mode 3: 15KHZ (bass), suitable for small dogs. The ultrasonic bark control device also has a T mode to check if the unit is working properly. Whether indoors or outdoors, this ultrasonic anti barking device meets your anti barking needs. 3.IPX4 DURABLE AND WATERPROOF BARKING BOX: Dog barking deterrent has a professional IPX4 waterproof enclosure. The shell is UV resistant and not easy to fade. Whether it's windy, raining or snowing, our no barking device can withstand bad weather and still work normally. The dog bark silencer is compact and convenient. You can mount it on a tree, inside a dog house, on a table or anywhere else for use. 4.FRIENDLY ANTI BARKING DEVICE FOR DOGS: Ultrasonic bark control device will not cause any interference or harm to the human body. The ultrasonic frequency emitted by the ultrasonic barking controller is within the average hearing range of a dog. Other family members or neighbors will not worry about being affected. It does not cause major punishment to the dog. It emits an ultrasound that only dogs can hear to get its attention. 5.BICOLOR LED INDICATOR: The bi color LEDs indicate whether the battery is fully charged. When the battery is fully charged, the green LED blinks once every 5 seconds. When the battery is low, the red and green LEDs flash alternately at an accelerated rate, 3 times in 5 seconds. The red LED lights when an ultrasonic wave is emitted. In test mode, the red LED blinks if the battery is low.