Quantity: One Ultra Dog Trainer. Using the latest ultra technology, the Wango Barking Trainer is suitable for dogs of different breeds and sizes. The ultra frequency is harmless to pets and humans. It can be used as a dog training aid to stop unwanted dog behaviors such as excessive barking, jumping, and digging. [Portable Anti-Bark Design] This dog bark control device is lightweight and compact, making it easy to carry in a pocket for indoor and outdoor use. It features a wrist strap for added convenience. Press the button to activate the device, which emits ultra waves. A green light indicates the device is operating, while a red light indicates it needs charging. [Rechargeable Dog Bark Controller] The latest version of this ultra dog bark controller simplifies training. It includes a USB charging cable. The device fully charges in 5 hours and provides up to 15 days of continuous use. Compared to battery-powered alternatives, this rechargeable design is more eco-friendly and cost-effective. [Effective Dog Barking Deterrent] The device has an effective range of up to 16.4 feet and emits 24kHz ultra sound waves. This frequency is inaudible to most humans (who typically hear up to 20kHz) but can capture a dog’s attention. Combined with audible beeps, it helps redirect unwanted behavior. Consistent training sessions are recommended for best results. [Suggestions for Use] When your dog exhibits unwanted behavior such as barking, jumping, or pulling, press the button and direct the device toward the dog. When the dog responds positively, offer praise and rewards to reinforce good behavior. Designed for reliable performance and ease of use.