Features: Cute shape: This lovely shaped dog bark muffler with cute appearance, high-quality shell, and is not easy to fade. Pet friendly bark control: using ultrasonic, providing easy way to train dogs and prevent excessive barking, ensuring a quiet and comfortable environment. Indoor and outdoor use: IPX4 waterproof rating, it is suitable for both indoor and outdoor use, hanging dog bark suppressors on trees, wall, or fence posts, or place them on tables or shelves. Build in battery: Equipped with 1500mAh battery and a status indicator light, the battery can provide 30 days working time when fully charging. 3-gear control modes: with 3 adjustable ultrasonic frequencies, 15KHZ-30KHZ is suitable for large naughty dogs, and 20KHZ is suitable for gentle dogs. 30KHZ is suitable for small dogs. Specifications: Material: ABS Color: white, black (optional) Size: about 8.89x8.89cm/3.5x3.5inch Product Name: Ultrasonic Bark Control Device Waterproof rating: IPX4 Power supply: USB 5Pin Battery: 3.7V1500mAh Input voltages/input current: 3.7V/80mAh Ultrasonic frequency: 15KHZ-30KHZ Package Includes: 1Pc Dog Barking Control Device note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.