Features 1. Safe and Effective Anti Barking Device: The upgraded dual-frequency ultrasound combines fixed and variable frequencies, allowing it to be used on a wider range of dog breeds and can stop barking more effectively. The anti barking device for dogs can also help you train your dog and correct bad behavior. 2. Portable Design: The pet gentle anti barking device is compact and portable. Easy to carry when you are walking your dog, walking or running. The effective range is 5 meters, perfect for training your dog at home or outdoors. It can also prevent other dogs from approaching you while jogging, walking or running. 3. Easy to Use Bark Stopper: You just need to press the button and then when you hear the beep, it indicates that the dog barking deterrent devices is sending ultrasonic waves to your dog to alert him to stop barking. Ongoing training provides effective and long-lasting results. 4. Rechargeable: This uItrasonic dog barking deterrent can be used for 15 days after being fully charged in 2 hours. The device fits perfectly in your hand. It comes with an adjustable anti-static wrist strap and Electronic Dog Repellent features installed rechargeable lithium batteries; no batteries needed. 5. Perfect for All Size Dogs: This uItrasonic dog barking device is suitable for small, medium and large dogs over 6 months and under 8 years. Not applicable for the following situations: aggressive dogs, hearing-impaired dogs. Specification Material: ABS, PC Color: Black Size: 10 x 4 x 3 cm Weight: 146 g Battery: 1200 mAH Using time: 8 hours Distance Range: 5 meter Package Include: 1 x Anti Barking Device 1 x USB Charger 1 x Lanyard 1 x Manual