Ultrasonic dog trainer, which can emit a piercing ultrasonic tone that dogs hate. With it, you can train your pet to be obedient, correct misbehavior and stop barking. Humanized design, safe to humans and harmless to dogs. Specifications: Model: ZF-853 Material: Plastic Color: Black Operation Distance: Within 12m Powered By: 1 * 9V Battery(Not Included) Item Size: approx. 135 * 60 * 30mm / 5.31 * 2.36 * 1.18in Package Weight: approx. 115g / 4.06ounce Package Size: approx. 195 * 180 * 35mm / 7.68 * 7.09 * 1.38in Notes: The device will be ineffective under the conditions such as: 1. Your own pets, which know you will not hurt them; 2. When the circumstance is too noisy like downtown area or busy kerbside; 3. Dogs under the protection of their owners stand beside them; 4. Trained dogs familiar with these kinds of devices; 5. Low transmission power when battery voltage is low. Package List: 1 * Anti Barking Device 1 * User Manual(English)