Product Description: The dog is our friend，but sometimes its barking is bothering us. Unexpected barking often disturbs neighbours. How do we let our dogs become more gentle?This item is designed by sound control and fitted on the wall. When the dog barks，the sound arouse electric circuit. Ultrasonic wave will emit from the item，it discomforts dog but has no harm to dog. Such ultrasonic wave is heard by the dog only，except human.After several repeated actions，the dog knew the extra sound had been caused by its barking，so a conditional reflex is established. Afterward the dog wound not bark without reason.Product Features:100% brand newHumane solve dogs' barking problemsColor:As the photos' shownMaterial:Hard plasticPower Supply:DC 8.4V，500mAPower Adapter Input Voltage: AC 100V~240VAdapter Plug: US PinSKU:SKU20142634Quantity:1pcs.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 easilyDrilling 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. Package includes:1× Wall Mounted Anti Dog Barking Control (With Pack)1× US Pin Charger Adapter2× Screw1× Wall Mounting Plate