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, chewing, digging and more. Wide application:Perfect for training various dogs, such as pets, dogs in police , Collie, Border Collie, shepherd dog, etc. Easy to operate:first open the battery cover and then put 1 piece 9V 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. Multi-functions:except as a pet training tool, it also can prevent you from dog attacks, suitable for outdoor work, travel and security night patrol. Description: Brand: Anpro Name: Dog Repeller/Anti Barking Device Material: ABS Color: yellow Size:140*40*30mm / 5.51*1.57*1.18inch Powered by: 9V battery (not included) Net weight: 55g Package included: 1 x Dog Repeller(Battery not included)