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. 

• Senses your pet's SmartKey and signals you that your pet is at the door.
• Detects pets indoors and outdoors
• Adjustable detection range up to 3 feet
• Adjustable volume levels
• Works for up to 5 pets