How close does the cat need to be before it activates? And also for the Pet Porte one Tim if you read this?
Hmm, not entirely sure, fairly close, although the sensor is in the porch which sticks out, so in essence the cat is below this when it triggers. It's not such an issue for me, since I put mine in a wall, so the porch is outside, and the flap is on the inside of the wall, so probably 12 inches further inside.
As far as I know Talisker has never bopped his head because the latch hasn't had time to operate, although it seems to detect and open the door pretty fast, so I suspect would work with even a fairly fast moving moggy.
All I need to do is wave a cat at it and tell it to remember it?
With the Pet Porte, you hold down a couple of the buttons to switch it into learn mode, and then you've got 30 seconds to put the cat under the sensor. They suggest that initially you program cats in before you mount the door, that way you know it works, and it's easier to do, since you just wave the sensor over the cat sat on your lap.
Once it's all mounted, it would involve shoving cats through the door (whilst in learn mode).