The "Sure" flaps are great. We keep our cats in at night, and have the flap programmed to only allow inbound after 8pm, until about 6am (at this time of year),

The "Sure" flaps are great. We keep our cats in at night, and have the flap programmed to only allow inbound after 8pm, until about 6am (at this time of year), and it keeps other cats out.