Features:The dog bark device emits harmless, but 8s effective ultrasound which can not be heard by human but by dogs to control your own dog or your neighbor's dog from excessive barking. Safe and harmless for dogs.The anti dog bark deterrent sports an exquisite and beautiful appearance.Wall mounted type for space saving.This product uses sound accumulation (integral circuit) triggering mode, that is, single bark or short noise around will not trigger, under normal circumstances, only more than three consecutive barks will trigger.Made from premium materials, safe and available for long lifespan.Specification:Condition: 100%Brand NewHousing material: ABSColor: WhitePower supply: 8-9V DC/500mASize: approx.13*7*5cm / 5.12*2.75*1.97inPackage List:1* Barking Controller1* Power Plug1* User ManualAll Necessary AccessoriesInstallation steps:1. In the only way for pets to enter, where there is no rain, no humidity and no sunshine, fix the fixtures to the wall where you need 40-50cm from the ground; drill holes according to the fixed holes of the wall panel, and fix the wall panel with screws and nuts;2. After all the fittings have been installed, press the fixture on the back of the bark stopper into the fixture on the hanging wall panel and adjust it to a slightly downward inclination of the round "eyes" at the top and the "mouth" at the bottom.3. Connect the power cord, insert the power cord into the hole under the bark stopper and plug in the electricity (choose a place where there is no rain, no humidity and no sunshine)Note:Please allow 1-3cm error due to manual measurement and make sure you do not mind before ordering.Please understand that colors may exist chromatic aberration as the different placement of pictures.