100% brand new and high quality The dog is our friend, but sometimes its barking is bothering us. Unexpected barking often disturbs neighbour. How do we let our dogs become more gentle? This is the New Humanely Ultrasonic Anti No Bark Control Device Stop Dog Barking Silencer Hanger, which trigger the ultrasonic wave circuit work through the barking, it will sent out five seconds harsh ultrasonic wave to stop the barking. The dog will build up the conditioned reflex after experienced many repeated the action times, the dog knew the extra sound had been caused by its barking. Afterward the dog wound not bark without reason. In generally, this product will trigger after more than three times barking. With this product, you will liberate from the annoyed barking, and will create a quite environment for you Features: Humane solve dogs' barking problems Material: Hard plastic Power Supply: DC 8.4V,500mA Power Adapter Input Voltage: AC 100V~240V Adapter Plug: US Pin Size:12.6 x 7 x 4.5 cm Color: As the pictures shown How to use it: Place the item 1~2 meters far away from the kennel, note keeping from the rain and humidity, assuring people can not access easily Drilling holes on the wall according to the wall mounting plate, and then insert the plastic base and fitting wall mounting plate using the screws A power socket is be needed around this item Adjust the item's direction to the dog activity area Plug the adapter, turn on the item, completed Note: Do not install in damp, leaking sunlight and easy to encounter a place If there is the great noise in the around environment, and the noise last long time. Highly suggest that you had better not use this product, the noise environment will affect this product's using life Note: Adjust the sensitivity: Using the slotted screwdriver from the back of the hole,Clockwise to turn it the sensibility will be high, otherwise counter-clockwise will be low Quantity:1 Set Note: Due to the difference between different monitors, the picture may not reflect the actual colorof the item. Thank you!