What can you do when your dog starts barking non-stop? With the ultrasonic dog trainer you can train your pet to be obedient, correct bad behavior and stop barking. The trainer is based on the theory that ultrasonic (more than 20KHZ) is above the upper limit of human hearing and super ultrasonic and 2800mcd strong white light. It can activate visual and additive activation for dogs, cats and other animals, but there will be no effect on humans.Features:A must-have item for pet owners, perfect for training all kinds of dogs.Trains animals to be obedient, correct bad behavior and stop barking.Just flip the switch and use effectively.It is a powerful 2800mcd ultrasonic white light.Expel fierce dogs effectively and protect you from vicious dog attacks.Because ultrasound is above the upper limit of human hearing, there is no effect on people.No harm to humans and pets can be used as a torch at usual times.With strap easy to carry, portable, convenient and easy to use.Features:Main material: ABSColor: yellow, black (optional)Frequency: 25 KHzSound pressure: 130dBMax current: 130mAPowered by: 9V battery (not included)Item weight: 64g / 2.26ozItem Size: 13*4*2.6cm/5.12*1.57*1.02inPackage weight: 72g / 2.54ozPackage size: 15*5*4cm/5.91*1.97*1.57inNote:Ultrasound travels along a straight line.The working distance is about 5-10m, need to aim at the dog's head.It will be ineffective under conditions such as:1. Your own pets, who know you won't harm them;2. When the circumstances are too noisy like downtown or the busy sidewalk;3. Dogs under the protection of their masters stand by their side;4. Trained dogs familiar with this type of device;5. Low transmit power when battery voltage is low.List of packages:1 * anti-bark device