Ideal for multi-cat homes, this cat flap lets you control which pets can exit and enter using their existing microchip as an electronic door key. It is battery powered (4xAA not included), works with all microchips and stores up to 32 cats. Easy to fit, drop-in replacement for most cat flaps, one-button setup. Mounting adaptor required for glass installations. Flap size (mm) 142 w x 120 h. Made from plastic. Suitable for small, medium and large sized cat . In/out/opened/locked. Max shoulder width 14cm. Suitable for: glass, wood and most types of PVC doors. Can be fitted into windows. H12, W14.2, D7cm. Manufacturers 3 year guarantee.