PetSafe SmartDoor Wall Entry Inner Extension Habitat Self-warming material radiates heat back

Self-warming material radiates heat back to your pet

and a health counter

Dimensions: 8" x 6" x 6"

Ability to secure your dog(s) within a set boundary

all pets within range will hear a 2-second ultrasonic tone

PetSafe SmartDoor Wall Entry Inner Extension Habitat Self-warming material radiates heat backThe PetSafe Tunnel Extension for the Large SmartDoor Pet Door allows you to expand your main wall tunnel from 7" to 9". Features: Compatible with the Large Electronic SmartDoor (PPA11 10709) Each extension adds 2' inches. This tunnel must be used with the Wall Conversion Kit (not included). Item Details: Size: Large Color: White