Description: This product adopts double channel enhanced, double dog training, excitation drive dogs, liting function is one of the super ultrasonic drive dog unit, the appearance design is exquisite, easy to carry, especially suitable for outdoor work, outdoor travel and security night patrol, and all kinds of dog training use. Used to prevent dog attacks, issue ultrasound to repel the dog or wild wolf. In normal situation, it can be used as a normal flashlight to illuminate at night. Ultrasonic wave reaches up to 125db. Audible to dogs but not to human. Effectively target animals up to 20m away. Can also be used as dog training device. Model: MT-651E Housing material: plastic Color: black Size: 14cmx6cm (HxW) Power: 1*9V battery (not included) Quantity: 1Pc Suitable users: joggers, walkers, bicyclists, delivery people, police. As different computers display colors differently, the color of the actual item may vary slightly from the above images, thanks for your understanding. Please allow 1-2cm measure error due to manual measure. ?