1. Ultrasonic Dog RepellerUltrasonic Dog Repeller uses powerful ultrasonic waves from 25kHz to 40kHz to interrupt the barking reflex loop and eliminate barking, chewing and chasing without harming the animal. 2. Builtin LED lightUltrasonic Dog Repeller Equipped with two powerful LED lights to make your nighttime walks safer. This convenient feature will illuminate your path and increase visibility for you and your dog on nighttime walks. 3. Longlasting battery lifeUltrasonic Dog Repeller Builtin 800mAh Liion battery, with longer battery life. A single 45minute charge can provide up to 30 days of use, providing longlasting performance to ensure your device is always ready to go. 4. Easy to carryUltrasonic Dog Repeller Made of quality ABS material, sturdy and durable. Ergonomic handheld design, small size makes it easy to put in your pocket, bag or car, convenient to use at any time.