Safely deter unwanted dog behavior and protect yourself on walks with this versatile 3-in-1 training device. The ultrasonic function emits a high-frequency sound (125dB) that's effective up to 20 meters away — audible to dogs but not to humans, making it ideal for training or deterring aggressive animals without causing harm. The built-in LED flashlight provides reliable illumination for nighttime walks. Compact and lightweight, it fits easily in a pocket or bag. Perfect for pet owners and anyone who walks in areas where dog encounters are a concern.