What can you do when your pet dog starts barking non-stop? With the ultrasonic dog trainer, you can train your pet to be obedient, corrects misbehavior and stops barking. The trainer is based on the theory that ultrasound (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 to dogs, cats and other animals, but there will be no effects on people. Features: A must item for pet owners, perfect for training all kinds of dogs. Trains pets to be obedient, corrects misbehavior and stops barking. Simple turn the switch and use effective. It is super ultrasonic and 2800mcd strong white light. Expel ferocious dogs effectively and protects you from vicious dog attack. Since ultrasound is above the upper limit of human hearing, there is no effects on people. No harms to human and pets can be used as a torch at usual times. With easy-to-carry strap, portable, convenient and easy to use. Specifications: Main material: ABS Color: yellow, black(optional) Frequency: 25 KHz Sound Pressure: 130dB Max current: 130 mA Powered By: 9V battery(not included) Item weight: 64g / 2.26oz Item size: 13 * 4 * 2.6cm / 5.12 * 1.57 * 1.02in Package weight: 72g / 2.54oz Package size: 15 * 5 * 4cm / 5.91 * 1.97 * 1.57in Note: The ultrasonic travels along a straight line. Working distance is about 5~10m, have to aim at the head of dog. It will be ineffective under the conditions such as: 1. Your own pets, which know you will not hurt them; 2. When the circumstance is too noisy like downtown area or busy kerbside; 3. Dogs under the conservation of their owners stand beside them; 4. Trained dogs familiar with these kinds of devices; 5. Low transmission power when battery voltage is low. Package list: 1 * Anti Barking Device