Item Type: Ultrasonic Dog Repeller _x000D_ Material: ABS_x000D_ Effective Distance: Approx. 5m / 16.4ft_x000D_ Battery Type: 4 x AAA Batteries (not included)_x000D_ Suitable for animals such as dogs, cats and snakes._x000D_ Problems with the use of product features:_x000D_ The ultrasonic frequency emitted by the ultrasonic dog repeller is 25-30KHz_x000D_ Different pets will have different reactions to the waves in this frequency band. Some dogs will feel uncomfortable and stop barking immediately. Some dogs feel comfortable hearing, will slowly quiet down and stop barking. Some dogs are not sensitive to ultrasonic, and they get used to it after listening to them. Not useful for pets either._x000D_ In general the following ultrasonic products are not effective for pets._x000D_ 1. A trained dog_x000D_ 2. Dogs who are not sensitive to ultrasonic_x000D_ 3. Dogs with ear injuries or hearing impairments_x000D_ 4. Ultrasonic hears too many dogs that have developed antibodies to ultrasonic 1Dog Bark Control and Dog Training: Our ultrasonic dog repeller provides a safe and effective solution for dog training and bark control. A bark guard can do effective training for your dog to stop barking, digging, eating unsafe food, fighting, and other unwanted behaviors. 2Suitable for Dogs of All Sizes: The average hearing frequency range for humans is 20HZ~20KHZ, dogs can hear a wider range from 15Hz to 120KHz. The ultrasonic bark control emits ultrasonic waves of 25?30KHz, so the sound will not affect humans, but can attract the attention of dogs. 3Easy for Outdoor Use: The ultrasonic dog barking device fits perfectly in your hand and comes with an adjustable anti static wrist strap. The control range is about 5m / 16.4ft. When we use ultrasonic technology, it works for dogs of all sizes. 4LED Indicator: When you press and hold the button of bark control device, it emits ultrasonic waves that only dogs can hear. LED lights up green when operating. Press the button for more than 10s and the barking control will auto turn off. Powered by 4 x AAA batteries (not included). 5Scientific Way: Stop barking device is friendly and safe for both humans and dogs. Humanized ultrasonic dog device completely frees your dog from cruel electric shock collars. Consistency and patience are key when training your dog, and remember to reward your furry friend with treats.1. User Guidance: Ultrasonic bark guards are not effective for dogs with hearing problems, we do not recommend using this product on dogs under 6 months or over 8 years old. Training is required for efficient and long?lasting use._x000D_ Notice_x000D_ 2. This device cannot be used to defend against aggressive and wild dogs._x000D_ 3. Do not immerse the unit in water or any other liquid. Avoid exposing the device to extreme cold or heat (below 0C or above 45C). Extreme cold or extreme heat may result in long?term deformation of the device and shortened service life._x000D_ 4. This device is not a toy, please keep it out of the place children can get it. Swallowing small parts can cause choking or other serious injuries._x000D_ 5. This device should only be used for dog training and barking control. Do not attempt to use it for any other purpose not described in this manual. 1 xUltrasonicDogRepeller(Battery Not Included) 1 x English Manual 1 x Lanyard