【Function】3 in 1 dog repellent/training dogs/lighting function. The super bright LED flashlight function is useful for walking or jogging at night. 【Human and Pet Safety】 The ultrasound emitted by Trainer Device uses physical methods to stimulate dogs and n have no effect on his health. No liquid propellant is used; Keep unfriendly dogs away, the ultrasonic dog trainer can effectively train your dogs to be obedient and stop some unwanted behaviors, such as barking, searching, chewing, etc. 【Easy To Use】Just need to press the button, no other tools required. Equipped with superior ABS and anti-static wrist strap, ideal for walkers. 【Pocket-Computer and Convenient】dimensions are only 4.7x1.6x0.9 in (LWH), and slip easily into your pocket. Comes with a lanyard, easy to carry anywhere, such as jogging or walking, cycling, park, etc. 【Wide Application】Perfect for various dogs, such as Shepherd, Poodle, Chihuahua etc.