Keep stray cats and wild animals from using your cat or toy dog's door. Electronic magnets, worn on your animal's collar, open the flap. Powered by a PP3 9v battery NOT INCLUDED for at least 12 months operation. Door is suitable for all doors. Four way locks for added control. Overall size is 7 5/8" x 9 1/2" x 2 1/4" thick. The opening is 6" x 6". Cut out size is 6 5/8" x 8 1/2". Available in white only.