Think of it as a automatic sliding door, but for your dog.
Description: No really, it is basically the same thing. This electronic pet door runs off of 4 D-Cell batteries (not included) and allows your pet automatic access through the door. The collar has an adjustable range of up to 3 feet so that when your dog approaches the door, the door unlocks and lets them in. Once inside, the door automatically locks behind him. The door itself also has 3 settings including:

• Locked: for when you're away from home or at night.
• Unlocked: to let your pets freely come and go without a collar.
• Automatic Access: enabling the collar and heightening your ability to get much needed relaxation.

The door is designed to be air tight increasing your savings on your energy use. This also reduces your pet from making all kinds of messes in your home. This is the door that will give your pet the freedom he deserves.

Dimensions:

• Fits door thickness 1 1/2" to 2"
• Product Dimensions - 9 1/2" x 15 3/4"
• Flap Opening Dimensions - 6 5/8" x 7 15/16"
• Great for pets up to 15lb

Sizes:

• Small: 17"Wx3.25"Dx27.1"H
• Large: 9.38"Wx3.25"Dx17.8"H

*Uses 4 D-cell batteries, not included