Professional Anti Barking Device for Dogs - automatically detects barking and emits ultrasonic waves to stop the dog's bad behavior, which is harmless and humane for dogs. It's an effective tool for dog training. Features This device is specifically designed to correct dog's bad behaviors. 3 advanced ultrasonic modes are suitable for all breeds of dogs. Extremely long effective control range up to 50Ft Built-in high-capacity battery can last 45 days of use USB rechargeable can be charged with adapters, rechargeable batteries, and laptops IPX4 waterproof level, durable for indoor and outdoor use Completely safe for both dogs and humans. Easy to use Three Adjustable Frequency Modes 1. Low-frequency mode for sensitive dogs 2. Medium Frequency mode for naughty dogs 3. High-frequency mode for excited & large dogs Note 1. Not recommended for dogs under 6 months or small dogs under 4.5 lbs. 2. May is not effective on old dogs or dogs with hearing problems. 3. The dog bark control device should face the dogs within the range of 50 ft. Packing List 1 x Ultrasonic dog bark deterrent 1 x USB Cable 1 x User Manual