Safe and HarmlessThis anti-barking device uses the latest ultrasonic technology, which is harmless, safe and humane to stop dogs from barking. Safe and HarmlessThis ultrasonic dog bark device uses high-pitched ultrasonic technology that is harmless to pets that are higher than the human hearing range, but it will cause the dog's attention without painful stimulation. Waterproof and DurableThis barking control device adopts IPX 4 waterproof material, which is durable, weatherproof, strong, and safe to use indoors and outdoors in any weather conditions. USB RechargeableThis anti-bark device has a built-in rechargeable lithium battery, which can be charged via USB and can work for 30 days after being fully charged Specifications and SizeOur whitebark control device size is 8.5X9.5CM, equipped with a wrist strap, suitable for most breeds and sizes of dogs Material: ABS Size: 8.5X9.5CM/3.3X3.7INCH Color: White Note: 1. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 2. Please allow slight dimension difference due to different manual measurements. Thank you for your understanding. 3. The dog stop should be placed at a height between 50cm-60cm, facing the dog within 10m. 4. For better use, there should be no obstacles between the anti-barking device and the dog. 5. Please stay away when the anti-barking device is in operation. 6. It may not be suitable for dogs with hearing problems. 7. It is not recommended for dogs under 6 years old and over 8 years old, and dogs weighing more than 50 pounds. 8. It is not recommended for dogs with abnormal hearing, grumpy or aggressive dogs. 9. It is not recommended to use one device for 2 or more dogs at the same time. Package Including: 1x Ultrasonic Bark Control 1x USB Data Cable 1x Lanyard 1x English User Manual