Dog-Friendly Barking Control Device: This anti dog control device uses ultrasonic technology to intervene in dog barking. When the microphone detects a dog barking, the automatic ultrasonic anti dog barking device will automatically emit ultrasonic waves, which make the dog quiet and have no impact on humans or other pets. 3 Adjustable Modes & 33FT Range: There are three adjustable modes of the anti barking device - high, medium, low, 15KHZ-30KHZ (high level) suitable for large and mischievous dogs, 20KHZ (medium level) suitable for gentle dogs, and 30KHZ (low level) suitable for small dogs. The maximum effective range of this ultrasonic anti barking device is 33FT. Lightweight & Portable: This dog barking box has a small and lightweight appearance, making it easy to carry. You can install it on a tree, in a dog house, on a table, or anywhere else you find it convenient to use. You can also carry it with you during outdoor activities for outdoor use. IPX4 Waterproof Dog Barking Box: This device adopts an IPX4 material waterproof shell, and the professional waterproof design allows you to use the anti dog barking device without worrying about weather factors. For some sudden weather conditions, such as rain and snow, the dog barking silencer can still work normally in these bad weather conditions, freeing your hands and bringing great convenience to you. Durable & Charging: This dog barking box is equipped with a 1500mAh rechargeable lithium battery, which can work for 30 days after 5 hours of charging. The shell material is sturdy and durable, without the need for other complicated operations, and the anti barking device can be used upon receipt (better charging effect before use).