Electronic Dog Door 

Doc replaces the electronic dog door. LINKS → www.howtowithd...
Doc replaces the girls' electronic dog door with the same model after many years of use. The dog door allows them to go out during scheduled times or you can have the dog wear a "trigger" / key that will allow them to enter and exit whenever they get close. This door is designed for average to larger dogs but small dogs with a little "courage" can easily push through it.
The Dog Door features programmable selective entry, exit and auto-locking option. Works with the waterproof SmartKey worn on your pet's collar; only the pets wearing the Smart Key can go in and out. Great for households with multiple pets; programmable for up to 5 Smart Keys. Designed for installation in interior/exterior doors; wall installation option available with purchase of Wall Install Kit.