Product Description: Color:Yellow, Black Material:ABS Item Type:Bark Deterrents, Repellents Battery Type:9V Alkaline battery (not included) Effective distance:5 to 10 meters Size:140*40*30mm / 5.51*1.57*1.18inch Sound pressure:125 dB Frequency:25 KHz Features: Ultrasound design: based on the theory that ultrasound, the dog trainer can effectively train your dogs to be obedient and stop some unwanted behaviors, such as barking, digging, chewing and more, also they are harmless to both humans and pets. Easy to operate: first open the battery cover and then put 1 piece 9V Alkaline battery (not included), the sound is audible only to pets, finally turn on the switch and it can work well, also they can serve as a flashlight when necessary. Handheld and Convenient: Size of the device is approx. 140*40*30mm / 5.51*1.57*1.18inch, which is portable and handheld, also convenient for you to carry anywhere you need, such as jogging or walking, cycling, park and so on. Multi-functions: except as a pet training tool, it also can prevent you from dog attacks, fit for training many kinds of dogs, such as pets, dogs in police and shepherding, suitable for outdoor work, travel and security night patrol. Three Modes: Training dog , Drive the dog , Illuminating. Package Include: 1 x Dog Trainer(No Battery) Description: The trainer is based on the theory that ultrasound (ultrasonic wave reaches up to 125db) is above the upper limit of human hearing and super ultrasonic and 28000mcd strong white light. It can activate visual and additive activation to dogs, cats and other animals, but there will be no effects on people. Three Modes: Training dog , Drive the dog , Illuminating. ULTRASOUND DESIGN EASY TO OPERATE HANDHELD AND CONVENIENT MULTI-FUNCTIONS