3 in 1 dog repellent / training dogs / lighting function. Super bright LED flashlight function is useful for evening walking or jogging. Ultrasound emitted uses physical methods to stimulate dogs and has no effect on dog health. No liquid propellant is used; Keep hostile dogs away, Ultrasonic Dog Trainer can effectively train your dogs to be obedient and stop some unwanted behavior like barking, searching, chewing, etc. Just need to press the button, no other tools required. Equipped with superior ABS and anti-static strap, ideal for walkers. Fit easily in your pocket. Comes with a lanyard, easy to carry wherever you are, such as jogging or walking, biking, park, etc. Perfect for various dogs, such as Shepherd, Poodle, Chihuahua etc.