Product Description What can you do when your dog starts barking nonstop? With an 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 waves (over 20 KHZ) are above the upper limit of human hearing and supersonic waves and 2800 mcd strong white light. It activates vision and additive activation in dogs, cats and other animals, but has no effect in humans. feature: A must-have item for pet owners, perfect for training all kinds of dogs. Train pets to be obedient, correct bad behavior and stop barking. Just switch there switch for efficient use. This is a powerful 2800mcd ultrasonic white light. Effectively repel vicious dogs and protect you from vicious dogs. ?Because ultrasound is above the upper limit of human hearing, it has no effect on humans. Generally harmless to humans and animals, it can be used as a flashlight. It is easy to carry with a strap, easy to carry and easy to use. feature: Main material: ABS Color: yellow, black (optional) Frequency: 25KHz Sound pressure: 130 dB Maximum current: 130 mA Power supply: 9V battery (not included) Product size: 13.8 x 5 x 3.5 cm. Package includes: 1 * dog trainer