1. The bird feeder is discreetly designed to protect you from barking dogs without attracting unwanted attention nearby. 2. Ultrasonic eliminates unwanted barking and weatherproofing is safe and effective for dogs of all sizes and breeds, except deaf or hard of hearing dogs; 9V battery operation - (battery not included). 3. Integrated microphone: The integrated microphone in the house has high sensitivity and can recognize the barking of dogs 50 meters away. Then activate high-efficiency ultrasound technology and ensure peace with the help of frequencies that are inaudible to humans. 4. Multiple settings: The device can be adjusted according to your personal needs and can be set to four different intensities. The bird feeder can be easily installed anywhere in your garden and is waterproof and weatherproof. 5. Easy to hang/install on trees, walls or fence posts to prevent your own dog or neighbor's dog from barking; attractive and discreet birdhouse designs look great in your home or yard. Using Ultrasound to Stop Dog Barking Effective range 50 feet Level 4 Operations Durable and waterproof Bi-color indicator shows battery level