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Battery powered cat flap with a unique coded collar key access for your cat only. Grey with see through flap. Two gold keys included. Helps keep out unwanted cats. Universal fitting for windows walls and doors to a max depth 54mm, optional tunnel for walls included for installation in to thick walls. Unique coded Collar Key. 4 Way Security Lock. Suitable for cats up to 7kg (15Ibs). Overall size: 241mm x 252mm - (9 1/4" x 9 3/4"). Cut out size Glass: Diameter - 212mm (8 3/8"). Cut out size Wood: 168mm x 175mm - (6 1/2" x 6 3/4"). Pet Max shoulder width: 150mm - (5 7/8").