Humane effective and maintenance-free the Bird-X Deer Gard ultrasonic deer repeller helps keep deer away from your property without chemicals. This Bird-X repeller mounts anywhere on your property and detects motion with an infrared sensor. Choose between motion activation or constant protection setting for versatility. Covering up to 4 000 sq ft the ultrasonic deer repeller can be used in yards gardens greenhouses and more. Use the Bird-X Deer Gard ultrasonic deer repeller to deter stray dogs feral cats deer raccoons skunks rabbits squirrels opossums armadillos rodents bats insects and other creatures.