Stray pets can often be a big problem, but the Cat Mate Electromagnetic Cat Flap provides a reliable solution. Your cat wears a small magnet that doubles as an identification tag. A sensitive, fast-reacting circuit in the cat flap guarantees instant entry for selected cats of all size and temperament. An easy to use 4 way locking system enables complete control over your cats movements. Product features Self lining to 60mm (2 3/8”) thick - ideal for all doors Battery powered - 1 x PP3/9V battery (not supplied) gives approximately 12 months operation Silent action will not frighten pets or disturb owner Transparent flap is preferred by most pets Draft and weatherproof brush sealed flap with magnetic closure Rainproof seal Easy to use 4 way lock Includes 2 x Cat Mate Cat Collar Magnets (Ref. 257) 3 year guarantee.