Using the energy efficient All Weather frame and flap design the Protector series lock-out slide offers an important exclusive accessory.
The Ruff Weather Door with Protector Alarm Slide is a patented unit that has an on/off switch to activate the audible ALARM to alert you that the interior slide has been even just partially removed. This is important for those who wish to know immediately that there is an attempt to exit as well as enter the pet door. This feature works when installed in doors or walls.

Features Include: Energy efficient double flap design, plus the added benefit of a closing slide to restrict the pet and an alarm to alert you if the closing slide has been removed. Pet door is made from durable rigid foam with a flap opening. Easy installation instructions included. Telescoping frame fits doors from 1 1/4" to 1 3/4" Thick.

Sizes:

Medium: 13" x 7 1/4", for pets to 35 lbs.

Extra Large: 17" x 9 3/4", for pets to 60 lbs.

Super Large: 23 1/2" x 15", for pets to 110 lbs.