125 decibels of ultrasound for the dog's auditory stimulus is very large, the longer you stay in this position, the greater the damage to him, it would quickly run away.Drive the Dog Principle: Dog repellent is mainly used in outdoor environment, prevent the dog attacks, when dogs trying to attack you, you can take out the dog trainer, emit ultrasonic to dog.Lighting: Upon the button at the bottom of the gear selector switch to "Light", products at the top of the button switch "ON", can be used as a flashlight.Training Dogs: Upon the product at the bottom of the gear selector switch to "Train" button, products at the top of the button switch "ON" the machine can produce ultrasonic, at this time you can train the dog.Prevent attacks: Touch the product at the bottom of the gear selector switch to "Chaser" button, the product at the top of the button switch "ON", the dog will run away.Easy Operation: As long as dog repellent close to animals, and for 2-3 seconds, press the switch button, under the use of appropriate operation, only animals will hear ultrasonic , and humans will not hear the sound. Effective distance of 33 ft, 9v battery included.Note: 1. In drive the dog mode, due to a strong power, power consumption is bigger, please do not hold the switch for a long time, generally by 3 to 5 seconds, loosen the switch after then, and press it again. 2.Please don't use it near human ears.24H Sale Service: The professional material insure the quality of item, please contact our Enlewlth LLC customer service or send email to our company's mailbox, we will give you a satisfied solution in 24 hours.Item Name: Hand held Dog Repellent;Main Material: ABS; Main Color: Black;Item Size: 13 x 5 x 2.5 cm/5.12" x 1.96'' x 0.98";Wrist Rope: 18 cm/7.08'';Weight: 0.14kg/4.93oz;Package Include: 1 x Handheld Dog Repellent