Pprovides security against strays. And this cat door does it without requiring batteries or household current!
The secret? The collar key itself is a magnet that actually unlocks the flap allowing access by your pet but not by other pets or strays. Naturally, as with all our pet doors, this one is perfectly suitable for small dogs as well.
A Tunnel Extension is available for installation in a wall and additional Collar Keys for additional pets are also available.