The Staywell Magnetic Cat Door is operated with a magnetic key. Your cat wears a collar with the key allowing him/her to get inside. Other animals, such as strays, not wearing the collar key cannot get in. One key is included but additional keys can be purchased to give multiple cats access. Door has a magnetic weather seal to protect against drafts. This door is white finish with a see through, rigid flap . The magnetic flap requires no batteries. SMARTDOOR comdr3$49.95 Please note that some of the houses pictured through out this sight have various upgrades and add-ons,most of the houses do not come with a window unless you add it and the standard door is made of wood with a vinyl flap.Unless stated otherwise in the description. PLEASE READ ALL INFO ON THE HOUSES THOROUGHLY BEFORE PLACING YOUR ORDER. MOST PROBLEMS ARE CAUSED FROM PEOPLE WHO HURRY THRU THE STORE AND THEN MAKE UNINFORMED ORDERS. AT THIS TIME, CUSTOM HOUSES ARE SHIPPING OUT WITHIN 10 BUSINESS DAYS. NEED IT QUICK? CHECK OUT OUR READY TO SHIP HOUSES.