This product is mainly used to avoid being attacked by dogs when going outDog Off can be used as a training device. Train your dog by pressing the Ultrasonic Dog Off Button to teach your dog not to bark continuously or correct any other unacceptable activities.Instructions:1. Training dog: Slide the function switch to the middle site, and then press the button switch BEAM on the top of the product2. Drive the dog: Slide the function switch to the last site and aim at the mad dog, press the BEAM button, the dog will run away3. Illuminating: Slide the function switch to the first site, press the "BEAM" button, the machine can be used as a light. Features:Train all kinds of dogs such as that are used as pets, in police and for shepherdingExpel ferocious dogs effectively and also cUsed as a torch at usual timeThree function grade switch and beam buttonWith a hand strip for easy carryingEasy to operateThe Following Conditions May Lead Poor Effect of Driving The Dog:1. Your own dog, because dog knows that his owner will not hurt him.2. In noisy environment, such as the downtown or the street.3. A well-trained dog.4. When the battery voltage is low.5. The dog listen ultrasound too much, has become accustomed to it, doesn't fear.Attention:Don't emit ultrasonic wave to your ears directly! This can let people feel uncomfortable. You'd better not use training dog's grade(middle) to illuminate, because the amount of current consumption in this grade is more than five times than that of lighting-grade! Specifications:Powered By: 9V battery(not included)Material: PlasticSize: approx.13x4x2.6cm/5.12x1.57x1.02''Color: YellowQuantity: 1 PcNote: 1.Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes:1 x Ultrasonic dog repeller (without retail package)