【function】 3 in 1 dog repellent,training dogs,light function.Super bright LED flashlight function is useful for walking or jogging in the evening. 【Safety of humans and pets】 The ultrasound emitted by the trainer device uses physical methods to stimulate dogs and does not affect the health of the dog. No liquid propellant is used. Keep enemy dogs away. The ultrasonic dog trainer can effectively train your dogs to be obedient and unwanted behaviors such as barking, searching, chewing, etc. to stop. < Br> 【Easy to use】 You just need to press the button, no additional tools are required. Equipped with superior ABS and antistatic strap, ideal for hikers. Br> 【Handheld and practical】 The dimensions are only 4.7 x 1.6 x 0.9 inches (LWH) and fit easily in your pocket. Comes with a lanyard, easy to carry anywhere, such as jogging or walking, cycling, parking, etc. Br> 【Wide application】 Perfect for various dogs such as shepherds, poodles, chihuahua etc.