Product description: Size: 9.5 * 4.2 * 3.3cm Color: dark gray Material: ABS Package includes: 1 * dog repellent Description: Updated Effective Sonic Bark Deterrents The updated dog bad behavior control device is equipped with two ultrasonic frequency modes - variable and fixed frequency mode, which makes it easier and more effective to get the dog's attention and correct the dog's wrongdoing . Safe and humane animal corrector. Easy to use with one button Easy to train with one button. If the dog barks, digs, fights, eats unsafe food, etc., just push the button and point it at the dog. The LED indicator lights up green when the device is working and sending out ultrasound. Lightweight and portable The dog training device is portable and hand-held. You can slip it in your pocket or pocket and are great for both indoor and outdoor use. It also prevents other dogs from approaching you while jogging, walking, or running. Long control range and USB rechargeable device The ultrasound machine is effective within 16.4 feet. The shorter the range, the better the effect. The built-in battery with a capacity of 1200 mAh can be fully charged in 5 hours, which corresponds to a regular use of 15 days. Suitable for most dogs The bark control devices can be used on dogs of different breeds and sizes. Not recommended for dogs under 6 months as this can impair hearing development and is also not suitable for aggressive dogs or dogs with hearing problems. For better results, do not use it in noisy environments.