Cat, Dog Mate Electromagnetic Door helps ensure that stray pets will not enter your house. Your pet simply wears a magnet attached to its collar which is identified by a sensitive, fast reacting electromagnetic circuit suitable for pets of all temperament. A 4-way locking system ensures complete control of your pet's movements into and out of your house. This neatly designed door is suitable for small dogs and large cats up to 14 shoulder height. Overall size: 9 1/4 x 11 3/4. Cut out size: 8 x 10 1/2.