125 decibels of ultrasonic for the dog's auditory stimulus is very important, the longer you stay in this position, the greater the damage to him, he would run away quickly. Principle of behavior of the dog: The dog repellent is mainly used in the outdoor environment, prevent dog attacks, when dogs try to attack you, you can take out the dog trainer, emit ultrasonic to the dog Lighting: on the button at the bottom of the selector shift switch to "Light", products at the top of the "ON" button switch, can be used as a flashlight. Training dogs: on the product at the bottom of the gear selector on the "Train" button, the products at the top of the "ON" button switch the machine can produce ultrasonic sound, at this time you can train the dog. Prevent attacks: touch the product at the bottom of the gear selector to the "Chaser" button, the product at the top of the "ON" switch button, the dog will run away. Easy operation: as long as the dog repeller close to animals, and for 2-3 seconds press the switch button, under the use of proper operation, only animals will hear ultrasound and humans will not won't hear the sound. Effective distance of 33 feet, 9v battery included. Noticed: 1. In dog lead mode, due to strong power, the power consumption is larger, please don't hold the switch for a long time, usually 3-5 seconds, loosen the switch after that, and press again. 2. Please do not use it near human ears 24H Sales Service: Professional material ensures the quality of the item, please contact our Enlewlth LLC customer service or email to our company mailbox, we will give you a satisfactory solution within 24 hours. Item Name: Handheld Dog Repeller; Main material: ABS; Main color: black; Item Size: 13 x 5 x 2.5cm / 5.12" x 1.96" x 0.98"; Wrist Rope: 18cm/7.08''; Weight: 0.14kg / 4.93oz; The package includes: 1 x Portable Dog Repeller Note: The data is all manual measurement, please allow 1-3cm error; due to the light and display difference, there would be some color difference, please refer to the actual object received.