LED Ultrasonic Dog Repeller Handheld Dog Trainer Device 3 in 1 Anti-barking Stop Bark Dog Deterrent Training Tools Features: Ultrasonic design: -Adopts ultrasonic technology,  make the dogs be quite and can effectively train your dogs to be obedient and stop some unwanted behaviors,  protect you from being attacked by unfriend dogs.  Multi-function device: The dog repeller have 3 functions, first one is the LED light function, second one can train your dogs with low intensity of ultrasonic, the last one is anti-barking function which depends on intense ultrasonic; Fit for training most kinds of dogs and pets.  Application methods: 1. Put your pet trainer directly at the dog or cat with an outstretched arm from a distance of approx. 6 ft away (effective up to approx. 20 ft). 2. Give the verbal command, then push the button for one or two seconds immediately. 3. Repeat the above steps until your pets follow your commands.  Specifications: Frequency: 25 KHz Sound pressure: 130 dB Max current: 130 mA Powered by: 9V battery (not included) Available distance: within 20 feet  Package included: 1 x Ultrasonic dog trainer 1 x User manual  Notes: ---If you find that it doesn’t work well in stopping dog from barking, please change the batteries timely. --We recommend using rechargeable battery. --When the dogs stay quiet, please don’t use the product to irritate them. --Use the ultrasonic bark control device within effective distance. --Dog repeller can work on most dogs, but sometimes it won't work on those giant dogs. --If the light gets dim, please change the batteries timely. --Please allow slight differences of the size due to manual measurements.