The Smart Ultrasonic Bark Deterrent is your reliable assistant in stopping your dog's barking. Using advanced ultrasonic technology, it automatically senses the dog's voice and once the dog stops barking, the ultrasonic emitter automatically stops transmitting. Simple and easy to use. Features: Smart Sensing: Automatically senses the dog's voice and once it stops barking, the ultrasonic emitter automatically stops transmitting. Wide Control Range: Effective range is 4.59 to 15.24 metersfor easy handling of various environments. Safe and Reliable: 100% safe for humans and animals, no shocks, no irritating odors, no beeps. Portable and Easy to Use: USB rechargeable design, charges for 5 hours for 30 days of use, lightweight and easy to carry. Suitable for all sizes and breeds of dogs: 4 sensitivity levels to choose from, adjust the sensitivity to the most suitable setting based on the environment. Specifications: Battery Information: Built-in lithium battery lithium battery, 3.7V, 1800mAh, 6.66Wh Size: 4.61x3.19x1.69in/11.7x8.1x4.3cm Weight: 160g/5.64oz Package List: 1*Smart Ultrasonic Bark Deterrent 1*USB Charging Cable 1*User Manual