Key Feature 1. The spray bark cap is flexible and compact, easy to use. 2. The receiver can be used normally when the dog is drinking water or in rainy days (IPX3 waterproof). 3. Auto Mode: Auto mode detects dog barking and automatically sprays to stop barking. The spray can be adjusted larger or smaller, and the external sound and frequency will not affect the product. 4. Adjust the sensitivity of the receiving system: the barking frequency of large and small dogs is different. This device is equipped with an adjustable sensitivity system, which can set high reception sensitivity or low reception sensitivity. 5. Spray: It is made from natural essential oils and contains no CFC ingredients. It is an eco-friendly product that is safe for humans and dogs. (Note: This product does not contain citronella spray, please buy it separately on Amazon) 6. Large Capacity: The bark cap has a large gas capacity. After being filled with gas, it can be sprayed 32 times, and a gas cylinder can be