Smart Pet Doorbell Alerts you when he needs in or out Say goodbye to the scratching, whining, and barking when your best friend needs to visit the backyard. You’ll stop waiting in the doorway, impatient for his return. Our Smart Pet Doorbell™ has an audible tone that tells you he’s ready. A must-have for busy homes. Product Features: Senses your pet’s SmartKey and signals you that your pet is at the door. Detects pets indoors and outdoors Mounts securely on door, wall, or glass Adjustable detection range up to 15 feet Personalize it with your favorite photo Adjustable volume levels Low battery indicator Works for up to 5 pets Requires 3 “C” batteries (not included) Pet Safe- Smart Pet Doorbell Operating and Training Guide