How the Invisible Fence® Brand Doorman™ Electronic Pet Door Works: Using radio-frequency technology, the Invisible Fence® Brand Doorman™ Electronic Pet
Door reads the Computer Collar® SmartLink™ II code and triggers a battery power driven flap to unlock so your pet(s) can come and go as they please. When Invisible
Fence® Brand Doorman™ Electronic Pet Door no longer senses your pets’ SmartLink™ II
code, the flap automatically locks back into place. The Invisible Fence® Brand
Doorman™ Electronic Pet Door can detect up to five programmed SmartLink™ II codes
and also operates in two other modes: locked mode and unlocked mode. We purchased this directly from Invisible Fence for just under $1000, but moved before we could install it in our home. The house we moved into had a different invisible fence system which this door doesn't work with. We no longer have the box for this, but we have the installation template and owner's manual. You WILL need to contact your invisible fence dealer for assistance programming this to match your pet's collar(s). I highly recommend checking with your local invisible fence tech before purchasing. Outside Dimensions: 28 inches tall x 16 1/4 inches wide Door Dimensions: 20 inches tall x 12 inches wide
Returns Accepted for this item if it's within 30 Days