Cheapest ever according to CamelCamel.
Works with your cat's existing microchip to keep out intruder cats and wildlife
Compatible with 9, 10 and 15 digit microchips
No collar or tag is required to operate the SureFlap, which can get lost or snagged
Runs off 4 AA batteries which last up to a year with normal use
Includes 4-way manual lock for controlled entry and exit