The All Weather Door With Protector Alarm Slide combines the energy efficiency of the All Weather Series with an exclusive alarm system that alerts the homeowner when the lockout slide has been unintentionally removed. The patented unit 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. Keep children safe and intruders out with the All Weather Door With Protector Alarm Slide. This feature works when installed in doors or walls. Optional wall kit sold separately. Measures 29H x 19.25W x 6D inches. Door opening measures 9.75W x 17H inches. For pets weighing up to 70 pounds.