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SureFlap Microchip Cat Flap White, small/medium

Reads your cat's existing microchip, or a Sure Petcare RFID tag sold separately. AA batteries last up to 12 months, says Pets at Home. Pets at Home rules out large cats, and thick walls or glass need extra fitting parts.

What the label and listing say

Microchip	Reads existing microchip or RFID collar tag (tag sold separately)
Power	AA batteries, up to 12 months

Where this came from

Pets at Home product page

Other cat flaps

PetSafe Microchip Cat Flap White, £70