Features: The dog bark device emits a harmless, effective ultrasound that is in ble to humans but detectable by dogs, helping to manage excessive barking from your own dog or a neighbor's dog. Safe and non-harmful for dogs. The anti-bark deterrent features a sleek and attractive design. Wall-mounted type for space-saving installation. This product uses sound accumulation (integral circuit) triggering mode, meaning single barks or short surrounding noises will not activate it. Typically, only three or more consecutive barks will trigger the device. Constructed from high-quality materials for durability and long service life. Specifications: Condition: Housing Material: ABS Color: White Power Supply: 8-9V DC/500mA Size: approx. 13 x 7 x 5cm / 5.12 x 2.75 x 1.97in Package List: 1 x Barking Controller 1 x Power Plug 1 x User Manual Installation Steps: 1. Mount the unit on the wall at the only entry point for pets, in a location protected from rain, humidity, and direct sunlight. Install 40-50cm from the ground. Drill holes according to the wall panel’s mounting holes and secure the panel with screws and nuts. 2. Once the mounting hardware is installed, attach the bark stopper by snapping the back fixture into the wall panel. Adjust the unit so the round "eyes" at the top and the "mouth" at the bottom are slightly angled downward. 3. Connect the power cord, route it through the cable hole under the bark stopper, and plug into a power source (ensure the location is protected from rain, humidity, and sunlight). Note: Please allow 1-3cm error due to manual measurement. Confirm sizing suitability before ordering. Colors may vary slightly due to differences in display lighting and screen settings.