1. Three Adjustable Modes for Training: The Dog Bark Deterrent Device has three distinct modes to help with your dog's training. Each mode can be used to deal with specific behaviors like excessive barking, digging, biting, or jumping, providing a gentle way to manage your dog's behavior. 2. Fast Behavior Adjustment: Barkshield Pro effectively stops unwanted behaviors such as barking, chewing, and chasing by targeting the Bark Reflex Loop, quickly correcting behaviors in just minutes. 3. BuiltIn LED for Safe Night Walks: Enjoy worry evening strolls with The Ultrasonic Dog Deterrent Control's builtin LED flashlight. This useful feature lights up your way, improving visibility during nighttime walks for you and your dog, making it a tool for pet owners. 4. 90Day Battery Life, 1Hour Fast Charging: It has 5V or 2A fast charging and a 90day battery life. Ordinary ultrasonic pens run out of power in 3 days, but ours lasts 90 days (10 minutes a day)! It fully charges in 1 hour with a 5V or 2A adapter (included). Red or green LED lights show low battery (red means charging).