Features 1. Dog bark protection device: By using ultrasonic dog repellent equipment, it effectively corrects bad habits such as barking, biting, and chasing in dogs. 2. Personalized training in three modes: Select three different modes for targeted training based on the specific behavioral problems of the dog, such as excessive barking, digging holes, biting, or jumping. 3. Attention grabbing lighting mode: Equipped with two lighting settings - constant light mode and fast flashing mode, it can safely and effectively attract the dog's attention without causing fear or discomfort. These multifunctional modes are suitable for training in different environments and can keep dogs focused even in the presence of interference. 4. Built in LED light makes nighttime walking easier: Equipped with a built-in LED flashlight, making nighttime walking easy and worry free. 5. Long battery life, continuous training: Provides up to 90 days of battery life, requiring only one and a half hour of charging. The high-capacity 800mAh rechargeable battery eliminates the hassle of frequent charging, allowing you to engage in uninterrupted training and achieve continuous behavioral improvement. Specification  Packaging size: 13 * 8 * 4CM Individual net weight: 0.108kg Battery capacity: 800mAh Working hours: ≥ 90 days Charging time: 0.5 hours Rated frequency: 15-40KHz Rated power: ＜ 3W Rated power supply: DC5V Package Include:  1* Bark Shield For Dogs