Ultrasonic dog trainers can make harsh ultrasonic sounds that dogs hate. With them, you can train your pets to obey and correct Abelses’ unreasonable and unreasonable behaviors, which is safe for both humans and dogs. Functionality: It can be used to train dogs, help them obey, correct inappropriate behaviors, and stop barking. It can emit harsh ultrasonic waves that dogs hate, expel hostile dogs, and protect itself from dangerous attacks when walking, jogging or riding a bicycle. With the infrared function, it can improve the ability of the dog to expel from a longer distance. It can also be used as a flashlight in normal time, which is very convenient to use. Working on most dogs is safe and effective, but it will not harm people and pets. The rope is convenient for carrying. characteristic: Model: ZF-853 Material: plastic black Power supply: 1 * 9V battery (not included) Item size: about 135 * 60 * 30mm/5.31 * 2.36 * 1.18in Package weight: approx 115g/4.06 oz Package size: about