Effective Dog Barking Deterrent: The dog barking device is designed with 4 working levels, effectively using ultrasonic waves to stop barking from 30 feet away, covering both areasindoor and outdoor, but also preventing barking from the neighbour's dog. Safety Anti-Bark Device: The ultrasonic anti-bark device adopts high-pitched ultrasonic technology, which is harmless to pets above the human hearing range, but will attract the attention of pets. dogswithout painful stimulation. Effective for most dogs: The ultrasonic anti-bark device is suitable for most breeds and sizes, but not for deaf or hard of hearing dogs. Some dogs may be afraid or dislike the sound of the ultrasound anddon't stop barking in the first place. Please allow up to 2 weeks of training time. Note: 1. Please allow 1-3 mm error due to manual measurement and 1-3g weight error make sure you don't mind before ordering. 2. Due to the lighting of the photos and the difference of monitors, the pictures may not reflect the actual color of the real item. Please make sure you don't mind before ordering, thank you! About Shipping: 1.please pay attention to your delivery address such as: name, street, house number, doorbell/email without name, etc. is correct, or the order will not be delivered correctly. 2.All items will be shipped within 3 business days after the payment is received. Most times you will receive them within 8-12 days then. The specific delivery time is depend on circumstances. 3.During the shopping process, if you have any questions, please feel free to consult us, we will reply you within 24 hours Hope you have a pleasant shopping experience!