ChanFong Ultrasonic Dog Repeller Chaser Anti Barking Dog Training Device For Long Distance Dog Pet With LED Light And Battery Work Principle This product is mainly used in outdoor environments to prevent dog attacks.When you encounter the dog which trying to attack you,please come up with this"super weapons" , this weapon will launch ultrasound immediately to the dog.The excitation of 130dB of ultrasound on the dog's hearing significant,super-bright flashing LED's also make the dog clear where the source and location of the weapons is in order to understand what you are against it, The longer you stay in this position, the greater the herm to him, which left helter-skelter. Operation Method (1) Lighting: Silde the Function switch to the "Light" site, press the the "ON" Button on the top, the machine can be use as a flashlight. (2) Training Dogs: Sild the Function switch to the "Train" Site, Press the "ON" button on the top, the machine can be use as a training Dogs. (3) Chasing Dogs: Silde the Function switch to the "Chaser" site, press the "ON" Button on the top, facing the dogs for a few minutes time, It will chase the dogs Away. Kind reminder The Following conditions had no significant effectof chasing the dog: (1) they are breeding dags, dog knows that his owner will not hurt him. (2) A Dog with the owner or a well-trained dog. (3) When the battery voltage is too low, the ultrasonic energy issued by the products will be reduced.