EASY TO USEOpen the cover and put the battery in, turn it on with switch button and choose mode that you need either training or chasing modes | ULTRASOUNDOur pet trainer works at 25KHZ, the sound safely grabs your dogs' attention. Stops dog from barking, chewing unwanted things such as furniture at home or trash outside and a lot more! | TRAININGPerfectly works for training dogs, the sound is only audible for pets so you will not feel any discomfort while walking you pet, also good to behave it. | PORTABLEReally lightweight to bring it with you all the time in case dog decides to behave aggressively, it is handheld with wrist strap on it so take it to the park, home or car. |