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. You will love it Buy it today You cant miss it Features: 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. With this product you will liberate from the annoyed barking and will create a quite environment for you. Humane way to solve dogs' barking problems. Fashionable and practicable design Nice shape and unique style. and durable. Light weight and portable. Specification: Material: Hard plastic Power Supply:DC 8.4V 500mA Power Adapter Input Voltage: AC 100V~240V Adapter Plug: EU US AU UK Size:12.5 x 7.8 x 4.5 cm Color: White How to use: 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 needed around this item. Adjust the item's direction to the dog activity area. Plug the adapter turn on the item. includes: 1x Wall Mounted Anti Dog Barking Control 1x Charger Adapter 1x mounting bag 1x Users Manual