Cat Mate Electro-magnetic cat door
Works well, but my cats don't like, and won't wear, the magnet. Therefore I had to bypass the magnet feature, by opening the fascia and sticking a piece of rolled up index card between the magnet operated bar and the top of the frame. Since the magnet lock is disengaged, I have to lock it at night to prevent raccoons, and my cats, from entering. But I can't think of a different method of ensuring which animals come through and which other ones don't.
ProsIt works great and looks good.
ConsThe cumbersome magnet the cat is supposed to wear.